I checked some of the points as listed in service guide ,DS1Tp1 is 6.6v where it should be 6vTp2 is 25.6 v instead of 23v Tp3 is 14.9 v instead of 15v DS2 Tp2 is 5.2v instead of 5v Tp3 is 4.5v instead of 100v Tp4 -14.9v instead of 15 so Iam guessing ssomething wrong in this area , anyone have the same issue??.
I would not worry too much about voltages of Tp1 ,2, 4 as they are close, you can adjust their respective trim pot if you know where. PCB A1A7 and the relevant schematic on pg.6 & 7.
You have a already found the problem in Tp3 which should be 100V. ( the raw incoming AC is 118 Vac.)
Look at the 100V fuse on this pcb, is it blown/open? You can pull out the pcb sitting in it's connector? Check fuse with your multimeter in buzzer mode or visually. Make sure your lighting is bright enough for you to see
and work properly. Again high voltages are present be alert!
PS 100V supplies the vertical and horizontal deflection circuits of crt. Also know that this instrument is 32 yrs. old so expect voltages and component tolerances to drift some .
Be aware that after powering off the high voltage capacitors will still hold the voltage so discharge the cap with a 5W or 10W ceramic power resistor say 1K ohm or higher for slower discharge. You have been warned.
before diving in with your hands. Alternatively wait awhile but there will still be voltage on the cap.