Icom 740 display frequency problems.

Wondering if anyone has had this problem with the Icom 740. I like my old gear and love the receiver on this radio, but it developed a problem after I replaced the complete front of the rig because I had a processor switch problem and turned it on. The frequency display started scanning at a rapid rate on 24.5, 28, 3.6, and 1.8 Mhz, on 28, 21, 18, 14, and 7 Mhz all is Ok.
I have full output on all bands. The bands where it scans I can lock the freq and it has full output and reception.
This is a good one, does anyone have any ideas where I should start? I checked all connections and cleaned all pots and switches but no luck. Is it time to replace this back up rig? Any help would be appreciated.

 

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