Several IC recessed Elco cans have failed. The plate inside the can gets discolored, see attached photo. A new bulb wont work. Is there a known problem with the can thermal shutoff switch?
Are we looking at the socket inside the can?
One problem with sockets I've seen in cans that have made for premature bulb failure have been that the contact in the socket isn't making good.......................well, contact. The bulb contact as well as the socket contact will become black, from the arcing taking place.
With the power off, a paint can opener/bottle opener combo-pull the contact down some.
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