Well, I agree, it may be the old cap problem, but it did die after a power failure, not while in service, so re-initializing isn't going to hurt anything. To replace the battery just wiggle it off and solder a new one on.

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"Old phone guys never die, they just get locked in some closet with an old phone system and forgotten about"

Retired, taking photographs and hoping to fly one of my many kites.