B&K Model 400 CRT Tester

[Kawooa]

I have bought a b&k model 400 crt tester. I just went through the parts testing resistors to determine what needed to be replaced. The schematic lists no capacitor in parallel with the meter. But on my tester there is a capacitor in parallel. It just so happens to be 250uf 6vdc. Should I remove I or replace with a new one? Everything else looked fine aside from some resistors being off. The big power resistor of 10w is off. The 40kohm side measures 14kohms. Both 10kohm sides measure 8.5kohms. Should I remove from circuit and test again or just replace with new ones? I am going to see about ordering parts soon to get it working. Then I'll test my 17bp4(listed in TV cabinet, nothing on tube) tube. Will this tester cover it and what if anything needs to be done to ensure I won't blow my tube? Or tester. The tester over all is in good shape with some small to medium patches of rust. Two of my three ne-48 bulbs are broken. Don't know how to test the third. Aside from normal cleaning which I finished like a hour ago and standard replacement of off spec parts, what else should be done to ensure safety and something in calibration? If possible with this thing. Sorry to be asking so much. I'm young(18) and only into trying to repair vintage electronics for not even a year. Only been collecting vintage technology for 2? years. Well I got a lot to learn. Thanks for any help.