I was kinda hedging my offer because knowing MDT Tech®, I figure most of the work would be PM and not repairs since he only purchases quality stuff. I'll bet the rider mower is something top-notch like a Honda, Wheel Horse, Deere, Scag, etc. so again, mostly PM!
I'll admit I'm getting a little lax as I get older - haven't disassembled, cleaned and re-greased my ratchets in over a year, and the other day, I noticed oil on the box end of my 14 mm combination wrench - I must have forgotten to wipe it off the last time I did an oil change. With training, I'll bet I can get back into the groove though!