Transmission fluid lab analysis report - how bad does this look?

Are there any long-timers here who can help with guidance/advice on the lab analysis report?

2002 Prius, just had transmission fluid replaced for the very first time at 151,413 miles a couple of weeks ago, after reading posts here by 3prongpaul and Bob Wilson. The service technician was a little reluctant to drop the pan and clean the screen, but did do so. It turned out that it "looked pretty bad and it was a good thing we did drop the pan" (his words). I sent a sample to R&G Labs, and just received the results today. Is this as alarming as it looks to me, and what does it all mean?

Oil Analysis Severity Summary
Severity: S = Severe

Oil Analysis Severity Report
Recommended Action:
Please provide ISO lube grade for the lubricant used in this unit. Consider changing the lubricant in this unit. Consider inspecting this unit for abnormal wear modes. Check for sources of abrasives entry.
Data Interpretation:
Several values have been flagged for observation. Abrasive contamination is suspected based on the silicon content.

Oil Analysis Data Sheet Report
WEAR ELEMENTS
Iron Fe 692
Chromium Cr 11
Molybdenum Mo 0
Aluminum Al 61
Copper Cu 550
Lead Pb 42
Tin Sn 23
Silver Ag 0
Nickel Ni 50
Vanadium V 0
Titanium Ti 2
Manganese Mn 7
Cadmium Cd 0

CONTAMINANT ELEMENTS
Silicon Si 375
Sodium Na 6
Boron B 48

ADDITIVE ELEMENTS
Magnesium Mg 6
Calcium Ca 356
Barium Ba 10
Phosphorus P 241
Zinc Zn 47

NON-METALLIC CONTENT
Water % vol Nil
Solids % vol <0.1

LUBE DATA
Viscosity @ 40'C cSt 26.4
Viscosity @ 100'C cSt 5.1

ADDITIONAL TESTS
Viscosity Index 123

I had sent along used paper towels with the sample, but the very helpful sales person at the lab said it didn't look like anything solid had been picked up, and she wasn't sure we'd get anything meaningful and that it may not be worth the $70 for the test. The lab's going to be holding to the paper towels for another week in case I do want to have it tested.

While following up with the service technician, I raised the question of doing a second change and drop the pan again in a few months to see if we can flush out any remaining bad stuff, and he agreed it may be a good idea. Does anyone have any recommendation on what would be a good interval to do so after this first change, time- or mileage-wise?

 

Thanks, Kenny94945. I searched further on PriusChat this weekend, and found a thread where Bob Wilson had started, and he listed several long-lived Gen 1s, which was kind of reassuring. But he also noted some transaxle failures. Much of the discussion was technical and quite over my head, but it sounded to me like he may have been suggesting a second change at 1,000 miles if the test comes back with high Si/Al amounts (not sure what 'high' is, but I guess a red number for Si may qualify). Think I'll send him a message to see if I understood that suggestion correctly. If he doesn't reply, I may just flip a coin between a 1K or 10K replacement interval, and ask that the screen be cleaned again.

BTW we did use OEM Toyota oil. That discussion thread seemed to conclude that Type T-IV used for the Gen 1s should ideally be changed at 15-30k miles.

Here's the thread I found DRAFT Transaxle Oil Testing Results | PriusChat

 

True. I've had the weekend to calm down and do more reading But, seeing that I'd like to keep the car for many more years, I'm willing to try anything I can do prospectively to achieve that.

 

Yup, $204.41 for labour and parts.