I have done over a hundred repairs of the 3332xA/B style attenuators. In the file listing in this site you will find a detailed step by step procedure with HPAK part nos. and Apple Rubber part nos. for the o-rings.
You may search the files by my name, or HP 8566 attenuator repair, HP attenuator repair, any of which should find the file.
The short of it is with the attenuator lid off and the contacts in the up (closed) position push the push rod toward the ball opening in the contact slot and lift the contact off from the push rod, when you have them all disconnected pull the solenoid down to the open position. Then you can push the push rods out of the solenoid slots replace the rubber o-rings and put them back into place, reversing the above procedure.
