Bojan - Nope, never got that far down the track
. I'll do one today though. Certainly makes sense to have a before and after.
Having said that, how much effect on PE do those main bearings have, presuming they're in reasonable condition as is?
James - As to Worm work, my basic plan is to change the bearings, clean & lube the worm assembly, check transfer movement and clearance, and of course adjust wormdrive backlash.