Tektronix TAS 465 power supply AA18020 adjustment

[jmpmex]

Hi, The power supplyof my TAS 465 is getting -8.7v on the  -8.6v output, the manua indicate that the maximun have to be -8.64v, but in the service manual the model of the power supply is diferent, in that appears an R43 potentiometer to adjust it, but in my power supply all the circuitry is diferent, and the R43 potentiometer not exist  , any one knows how to do the adjustment or the schematic of the power supply ASTEC AA18020?

Thanks