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I can relate with HVAC. Bryant's residential furnaces use glowplugs for igniting the gas. In the 80% units, they aren't too bad to replace. In the 90% (single and two stage) they are a bitch to get at. It takes longer to get it out and put it back in than it does to actually replace the part.
Unless the part(s) are under warranty, I always leave them with the client. I have replaced a few glow plugs. After the furnace is back up and running, I always show the client where the plug failed. In all cases, i show the client the problem. I did this when i did TV repair in the 80's (I was in my teens). To me, showing the client the problem and why I did what I did is the most important thing.
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