I took my RV into RV Master Techs (RVMT) into Goodyear to look at my Onan Microlite 4000 generator that was still in the RV bay.  The problem that I was having is that it would turn over and fire but would not remain running immediately after the starter button was disengaged.  They told me that they replaced the carburetor and that it was still doing the same thing and they wanted to take it to the local Onan place in town to have them troubleshoot it which I allowed.  RVMT told me Onan stated that the Stator was bad and the cost would be $1800 to fix.  I rejected that and had RVMT remove the generator from the bay so that I could put something else in there.  They removed the new carburetor and gave me the generator back without the old carburetor reinstalled.  I got the carb back in a box.  My neighbor is an experienced mechanic offered to take a look at the generator.  Before taking it apart, we immediately noticed that there was break in the armature as we could see that through the ventilation openings.  We removed and dismantled the generator and discovered that there was damage in the unit and we found the foreign metal object that caused the damage.  Here's the problem, before taking it to RVMT, the unit was free wheeling without hindrance that would have been noticeable with the extensive damage in the generator area, so that occurred AFTER I turned it over to them.  I was charged $300 for them to effectively remove the unit with the carburetor removed and with a more severe problem than when it was given to them.