[TenTec] frequency readout on my Omni VI needs touching up

[John King]

Does anyone on the list have experience with calibrating the frequency readout of a Ten Tec Omni VI Plus ? My OMNI VI Plus readout is somewhat low than the actual transmitted frequency on 75 meters. The frequency readout is off on some bands and on frequency on others. I would appreciate help with the calibration procedure. 

Thanks, and 73, John, K5PGW