Welder gave out on me.

As the title suggest my old Airco heliwelder V quit working.
I got this welder used about 20 years ago and it has been a great
machine up till now. It is a solid state unit so I believe it could
be repaired.
I am not skilled in electronic repairs but I am considering
picking up a quality fluke meter and having a go at it.
So I guess I would like to get some opinions on how you would
go about diagnosing and repairing my problem from
some of you guys that speak the electronics language.
I see a lot of post around here about electronic repairs by
some of you and honestly they usually are past my level of
understanding.
I am not ready to toss the machine out without at least a decent attempt
to save it.
So I'm thinking some advise on a capable model fluke would be a good place
to start. Any opinions? I am already feeling a bit lost without this piece of equiptment
working.