912ULS 1000hr Gearbox Inspection

Hi guys,

I am doing my first ever 1000hr gearbox inspection. My plane use MOGAS Unleaded, low ethanol (less than 10%)

I've heard everything (youtube) from having to fully disassemble the gearbox to removing everything but the shaft, bearing and oil seal. 

I did purchase all 3 shims and thrust washer. Also, do I have to take the clutch fully apart?

I do have my maintenance manuals, which I read,  but I like asking questions for tips from those who have done this inspection before . I have no issues doing a full disassembly, I just don't want to waste time on stuff that I should have left alone.

Thanks