I have the same subwoofer, my amp crapped out as well. I am going to take out the JBL amp and replace it with a dayton sa240. They are not close in measurement but I'm going to seal the old amp hole with mdf and cut another hole for the new amp.
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Sorry to hear that. The JBL PB12 are notorious for their amplifier module giving out. This item is not repairable nor is there a replacement (The module is potted into an aluminum heat sink). Actually, I need to clarify, as the late models used discrete components. If this is the case, either Repair it yourself (Google search PB12 Repairs) or take it to the local repair shop. (Or to a technical college with an electronics program, they may work on it!)
The best method is looking for a plate amp to replace the PB12 Amplifier - try the bash 300W. Several people have done this conversion. Be warned, you will need to do woodworking if you want to mount the plate amp on the box!
There is a quick way to find out if the parts are hard to get. Look inside a make a note of the IC and Transistor numbers. Don't bother with the resistors and caps. Put the numbers into Google and see what comes up.