AVS Special Member
Join Date: Jul 2009
Location: northern virginia
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Typically, it is very helpful to start with the service manual for the particular amplifier. Many manufacturers consider their service manual proprietary. To find one, try a large number of Google searches. If a site has the manual, it may cost $15-25.
You need a volt/ohm meter, soldering tool, and solder removing tool. In a very small number of situations, you get lucky and can identify a swollen or burnt capacitor. Capacitors (generally) deteriorate with age and heat.
Repair shops can cost $200-300+ and guarantee their repairs for 30-90 days. The difficulty is that other non-failed parts may be close to failing and fail within a few months of the initial repair. A few individuals have been able to identify an obviously failed capacitor which a repair shop replaced for them cheaply ($10-30).
Contact B&K because they may be able to offer a better deal.