Resistors - what do you do?

Just finished recapping my rockola 442 amp, its made some great improvements in sound, and the bass and treble controls really work now! The amp still has a residual hum that needs addressing, but this may be as I originally connected one of the PSU caps the wrong way! I changed that, but I may have damaged one of them Anyway, back on topic.

My next thought goes to resistors, as though less likely to fail or drift, the reality is i'm sure some are out of tolerance and will need replacing.

So I guess I have two options,

1) replace all resistors, simple but would remove many original and serviceable parts and is a blanket approach

2) test resistor, if value differs then snip a lead in case shunted and re-test.

But, assuming I tested them, do you resolder the old resistor back? I guess in this case desoldering from the PCB for testing would allow you to put it back as is, but is a lot more work than snipping it.

Just wondered how you approach such a task? The recap was simple as I got a full kit and changed them all

Yes--if you have mis-inserted a cap, and applied power, it sure is possible it's bad. Change it ASAP ! --before you apply power again !
Most of the resistors can be tested in circuit--try each one first-if within tolerance, it is OK--If outside tolerance, lift one end only off the pcb, and re-test it. Depending upon how the factory inserted it, it may or, may not come out easily. A "solder sucker", and some practice, will make this easier to do---( some techs like using a "solder wick"--I never have) Ron Rich