Hi My story isn't short, but I'll try to be. The amp was dropped accidentally from near-waist height flat onto the top down. After the drop, the relay started to be noisy and amp started AC outlet hum audible significantly via speakers and headphones. I ruled out amp/preamp by connecting it separately as preamp or amp only and the hum was in both cases. Next I open the amp bottom and wood case out and hook it up to my ipad, earspeakers and speakers. I also cut zip-lock from relay tied up to the AWM163 protection board. I started wiggling and wobbling boards at random one after another while listening to that miserable loud hum. Upon closer looking, I found that AWM163 board has been secured with zip tie and looks slightly bent. I cut that zip lock and felt that hum decreased by many decibels, but still audible. I believe that I have to replace caps on this board and there are three and probably transistor(s). That is to say that zip tie was used by 'techie' in order to cease hum instead of working on this board that is somewhat not to easy to access to remove... even after removing it tied up to wires on pins that are not easy to get around. So I guess my endeavor is to do things right at this moment regardless. The fact that the amp started substantially louder hum I guess was due to the initial faults of joints and possibly active and passive components as well. I'm not big fan of replacing components and I may probably try to go over solder joints prior removing this board. Thoughts?