My RCA TV appears to have "lost" some channels.

Most channels are OK. Cable Channels 48, 49, 50 are wiped out.
Channel 65/66 experiences intereference from over the air channel 14..
Other channels that I know I should get seem to be ok, including those
that might be effected by other OTA channels. RCA input video is ok
so I surmise it's an RF problem.

Here is the RF section:

http://www.mailsack.org/tvrf.jpg

Is there a way to open it, service it, replace (guess I could desolder
it), tune it, etc?

Thanks!

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