I don’t do a full service but here’s a few things I do when I get a rep (from a TD or a M2M). Remove the movement. Take the auto wind bridge and most of the easy parts to remove and put back together.
Give everything a once over. Get all the dust and dirt I can find out of there.
Look for excessive oil everything and clean that up with rodeco. Keyless works and mainspring areas always tend to have waaaay more oils than it should. Some are damn near gunked up.
Check the gears to make sure there are no broken teeth.
Use a air puffer and blow air all throughout the movement. You’d be amazed at what comes out of some of these watches.
De-magnetize the movement. Be careful with this as I recently found out that if the hands or markers are electroplated with gold or white gold, it will start melting or whatever that caused one of my hands to do this.
If needed, I also swap out the mainspring with a gen ETA one if the power reserve seems to be “ehh”. This is a fairly easy mod to do.
If you do all of this and something funky still happens, just get it serviced or just stick a gen ETA in there. It would cost pretty much the same.
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