to disamble the front part, all the knobs have to come off, then the nuts of some switches have to come off, maybe also the testpoint. then can the front aluminum plate come off en are the screws reachable where the front is helt with on the frame.
schematics of the philips PM3262 are mostly the same, psu also. known problem is the cascade for the HV of the crt. if you smell ozon when the scope is on, its allready broken..
here are the schematics of the psu and HV for the pm3264..