Manufacturer checkups

I am glad to see this subject out in the open. I frequently wondered why someone would send a perfectly good piece of equipment back to a manufacturer. It is a PITA physically packaging and bringing the piece to be sent as well as a probably expensive little endevor. I send things in when they need to be, not for innocent checkups. I have a hard time believing in innocent check ups. That said, I don't think it would stop me from buying such a piece.

I wouldn't be so optimistic as Sidssp.
If you hear

checked out last month by the manufacturer and given a clean bill of health

very often it spelled
"I pluged the unit and turned on and lights on" with no further testing.
When I open such units and see that there's 25 years old dust, I realize that spelling is totally different from what you're hearing just like in English101.

I have two friends, who when they buy used gear, often send it back to manufacturer for inspection, cleaning, calibration, whatever. Makes them feel better, and often not very expensive. Never do it myself.