340 oil galley plugs

Who assembled the engine? That's who is responsible for plugs missing.

I would call a shop a **** shop if they DIDNT take that plug out.
That's fine if they did it, but don't tell me you did not do it when I called them and asked specifically about what plugs they pull out, or at very least tell them when they picked the engine up that the plugs were missing and needed to be installed. I had 3 engines at that same shop and this is the first time it happened, maybe they did their job right this time.

Jake