You can download the service manuals here and read the service bulletin and check per manual.
http://manuals.harman.com/JBL/HOM/Service%20Manual/PB10%20sm.pdf
http://manuals.harman.com/JBL/HOM/Service%20Manual/PB12%20sm.pdf
Hopefully the ClassD module is not bad.
This is what I have done to my: http://s807.photobucket.com/albums/yy352/budm/JBL%20PB-12%20mod/
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