So it’s from 2002, ….that’s kind of a far cry from virtually brand new, …..rule out all the simple possibilities first, check that the grease hasn’t gone to concrete, look for broken wires, etc. …sometimes stiff older wiring can break right at a solder lug, but stay put, and even make a connection sometimes…..also, wires can break inside the insulation, and not appear broken, ……do a wiggle test while running to see if you can duplicate the complaint……you’re dealing with 20+ year old wiring,….anything is possible,……
Pat
