Tuner Problem with RCA Big Screen TV, Model D52W20?

I'm working on an RCA Big Screen TV, Model D52W20 / ATC 221 Chassis.The Set was allowed to get wet, and the Tuner became intermittent.The Picture was clear, then distorted, then clear, then had a herringbone pattern.Moving the cable didn't result in any change, so it wasn't a bad solder connection, that RCA is so very famous for.The Line Inputs, from an external source worked fine, for Hours on end.So, I removed the Tuner Board, unsoldered, and carefully removed both Tuners, and saw that there was mold on various parts of the Board, and tuners.I sprayed everything with clear Contact Cleaner, and carefully reassembled the Board, and put it all back together.When I plugged the set up, the Picture was very clear, and it was locked on Channel 19, but would not Auto Program.I switched the set off, and back on.Then, it went to Channel 2, and will not move beyond that, or auto program.It shows the scanning action on the On Screen Display, with the Double Dots going to the top of the Screen.But, it shows "0 Channels Found" and reverts to Channel 2.And, when I attempt to manually enter a different Channel, that Number will display on the Screen, but it still remains on Channel 2.I have been told that there may be a Factory Menu Setting that must be Re Programmed.This would be similar to the Zenith "Menu 9,8,7,6,Enter" that brings up "Factory Menu".Is this possible, or will it take a Factory External Programmer to correct this problem ? And, if only a Tuner Replacement will cure it, which one must be replaced ? Again, there are two. My Signal Source is from the Local Cable Company, and it works fine on all the other sets.And again, with an external input, the set plays perfect.