ICOM M802 Tuning Problem

[svcattales]

I have an M802 SSB with an At-140 tuner which I installed myself about 3 yrs ago. It has worked fine, but now the radio is not tuning to frequency. Specifically, when I push the "tune" button the word "tune" appears for a short time, then it reverts back to "thru". It does appear to be sending a tune signal, because both the forward and reflected needles jump on my SWR meter when I push the tune button.

Anyone see this same problem? I had this problem once before, but too many brain cells have died since then I can't remember what I did to fix it. I will check the connections on the control cable between radio and tuner, but that's kind of a pain to access right now.

I'll appreciate any help you can provide.