Bring your amp in to the shop or ship it to us and our amp tech will diagnose the issue and contact you to let you know what repairs are need to get you up and running. Our amp Drop Fee is $140. This will cover the first hour for our tech to remove your amplifiers chassis and test all the components to find the issue. Sometimes the amp can be fixed with in the drop fee cost and other times it may cost more depending on what components need to be replaced and or if you are having a complete re-tube and bias done.