Sunny Sky, I diasgree and think you are wrong. In over more than 50 years of flying, 90% of the time replacing the battery will solve all sorts of electrical problems (excepting CBs that continue to blow.) It can be done very quickly and cheaply (under $300) and at the most one might have to wait one night to get a new one by overnight delivery.
Many years ago, I was in the FBO busniess. Often customers would come in reporting various electrical problems. Our standing solution was to put in a new battery. If it worked, we charged only for the battery and no labor. If it didn't work (maybe 20% of the time) we removed it and started troubleshooting. With maintenance rates up in the $75 hour range, batteries are really cheap. One can keep the old one and if it's still good keep it as a spare. BTW, we got quite a few new customers that way.
You might ask Paul Sharp if he wishes that's what he had done.
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