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Do you mean Circuit board? If so then it will depend on how bad it is. For example if it has broken components on it. These would need to be replaced. A small crack that has broken the printed tracks could be repaired by soldering it back together and using wires to ensure it makes the required circuits. Really bad damage and broken parts will make it fit for the bin!
The ouput drivers have failed and along with the heavy current drain the resistors burnt off . So before the resistors are changed the entire section of the predriver and output section must be checked before new outputs are installed.
test the amplifier with a series voltage regulator and is there is heavy load drain then shut down and recheck till the drain limit is maintained to confirm the correct working of the amplifier.
Before asuming it is the power transistors check the power on relay first as mine had the same proble and it was because of the Relay that did not switch on the one channel or amp (remember this is a power amp and consist of two mono amps)
disconnect your load (speakers) and check.if it is o.k your problem is in speaker.if the problem goen your problem will be short circuit in speaker or cabels.-if not the problem will be in amplifier and this is not logic matter because it is new -anyway try to disconnect all inputs.if the problem goen your problem is in one of the inputs-try to connect input one by one until you find the bad one-if all above failed return your amps back to the shop.(from where you get them)