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LG RH188 HDD/DVD rec Spuriously starts REC, STOP, Keys don't work

LG RH188 DVD recorder > 2 years old
Suddenly started spuriously recording and/or stop. This occurs at various frequency (sometimes is Ok for 1/2 hour, ..., sometimes does continously).
Also found keys don't work (not sure when stopped becsuse never use) but remote works flawlessly.
Everything else seems to work OK too.
Seems similar problem to "Timeshift problem" above although timeshift doesn't seem to be a key function.

From service manual the key detection is done by 2 ADC inputs (keys change voltage). Both are affected. I have cleaned dust inside where I could get at but this didn't fix. Pressing keys generates the correct resistance. Haven't removed main board to get to the IO board and at the timer chip (as 2 inputs are affected unlikely to be a "contact" problem).

This seems a common failure to this product.
Has anyone found reason or a fix, or waht to look for ?
Could a return to factory setting fix this?

PS: I only have a RH197 manual, does anyone know where to get the 188 manual free?

Thanks for any help, willing to expriment to fix,...

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