This raido uses a VCO or voltage controlled oscillator, its tuned by setting the voltage into the VCO. Its an easy fix but requires a multi meter with a 5 place decimal and a spectrum analyzer. This is not done in the programing software. Did somebody use a magic screwdriver trying to get more power out of this radio? If not changes in the VCO voltage could be from the power circuit that feeds the VCO. Lots of variables to look at, if its programed properly the issue is in the reference oscillator. PM me if you would like to arrange tuning with an Agilent 4401A Multimeter and Areoflex 2975 service monitor.