So I have a 1990 Laney AOR that I bought off ebay last year. It hasn't been serviced but due to a gig this weekend, I need to get it done asap.

What are the average prices?

And what is the average time to look it over? And if anything needs replacing?

It makes humming noises and noises I don't want in general.

Can you figure out what needs replacing from that?

Cheers. So price, and time