Re: Request - information on how to diagnose a dying 547/545B HV ...
Re Chuck's observations on removing the old brown compound:
I'm no chemist, but I was taught that plastics fell into two broad groups: quoting from Wikipedia
" thermoplastics and thermosetting polymers.
Thermoplastics will soften and melt if enough heat is applied; examples are polyethylene, polystyrene, polyvinyl chloride and polytetrafluoroethylene (PTFE).
Thermosets can melt and take shape once; after they have solidified, they stay solid."
I thought the generic class known as epoxies fell into the thermoset category?