If I still had a schematic of the 8800 I could tell you exactly what to
do to correct problem this assuming it's just the PLL trimmer coil in
the oscillator circuit (which it usually is). There is a test point
associated with this coil and if you adjust the coil slug for an exact
voltage at the test point with the receiver set to a certain frequency
it usually fixes it. The adjustment is in one of the metal cans on the
top PC board. If someone can Email me a readible copy of the schematic
I can advise you.

Frank
K3YAZ
Tucson