I heard from one guy, who heard it from another, who was told by someone else that if you replace the capacitors from a broken alarm unit that it fix's them 75% of the time?

OK I'm not into cap replacement, because there are so many different ones, I considered getting some from this alarm systems installer but replacing the wrong one will just cause the same problem, and I don't want to have to come do the same call out with my head low, because it was my quick job.

Does anybody know whether it's worth the hassel to work it all out properly?