UPDATE: TOUGH DOG: RCA TV model 27V412T, chassis M134C turns off, then on by itself

[Brad]

Hi,
It looks like the problem is fixed (see below for details).

This is the first time I have encountered a button switch/s that tested good
(no "leakage" at 50V test), but turned out to have intermittent "leakage".

Thanks to everyone who offered their help, Brad