I got a Yamaha DXR12 speaker that the portection light was staying on and found 2 of the 4 mosfets (3603) bad on the Amp board. Replaced all 4 mosfets and this is my problem now and would appreciate any direction to help correct my problem. After replacing mosfets the speaker would power up and work fine, however if I turn it off and try to turn it back on the protection light would stay on and speaker doesn't work. Now if I leave the speaker off for 30 minutes and turn the speaker back on it would power up and work again. I was timing this cycle when it would start working again and 5, 10, 15, and 20 minutes wasn't long enough but at 30 minutes it would work again.