After posting my earlier comments and in the meantime while waiting for your response, I found these additional EFCs:
"Cancel" turns out to be TV/00002
"Timer Record" worked out to VCR/00130 which shows as "alarm" on one code list
I am still completely stumped on the
TV monitor 30 sec adv Main Menu/ ATR
functions. I would REALLY hate to have to try all 768 combinations by brute force, for several reasons. It's too much work, it could cause problems somewhere else, I could make clerical errors in entry and I'll never know if I did it wrong, or I could come up with nothing for any number of reasons.
How do you suggest I go about this for the most efficient solution? I have not seen any "complete" listing of the RCA function codes, only partial samples with maybe 100 function names between several lists.
As an extra bit of data, several of the EFCs have different results under different device selections. Some of the function names have no relation whatsoever to the actual results of the function it controls.