Mackie SWA1501 Base Bin - Circuit Boards burnt.

They are not publicly available. Mackie authorized service centers are the only places that will have that information. The amp (if it has failed) requires a bit of skill to rebuild, and up to 100$ in parts alone. (not including the speaker driver if it's blown). I have repaired several of these in the past, and they aren't that simple. There is also a service bulletin about 2 diodes that usually need to be swapped with one another because of a defect during manufacture (the parts were installed incorrectly). (One is D20) if you rebuild the amp, and fail to address the diodes, it will fail again very shortly.