Gigatronics / Spanwave 8652B power meter, calibrator power level adjustment

[alcobia]

Hi all.  I'm looking for help with a 8652x, looking for the service manual or a method to adjust (normalize) the meter's calibrator (the reference output).     
The 8652B power meter (similar to 8652A) reference output (0 dBm) setting is low by 1.13% (limit is 1.2%).  I want to normalize the setting, if possible.  I pretty much figure this is software enabled correction.  On the 8542C (older model version), the correction is made via the front panel menu (EEPROM) setting.  Does anyone know the correct command (syntax) or have a service manual for the meter?   
Thank you all...