My amp is blown!! Dont know what part to replace.

You have a bad mosfet. The output fets in the P6002 are FQA 28N15 and FQA 36P15 easily found at mouser, digikey, or allied electronics. Without a pic I could not know if you need power supply fets or output fets. Its an easy fix if you know what you are doing. Desolder the bad fet off of the mesha board, tin the new mosfet and resolder it back to the mesha board and replace your gate drivers and emitter resitor for that fet that was bad. Might check all of them with a meter to be sure. You can call Rockford and order a whole new mesha board and solder it to the pcb yourself. Be sure to use new silicone heat transfer compound. MG chemicals has some nice products.

Those are likely "chips" or "integrated circuits". can you read any words, letters, numbers off it? if it's a common off-the-shelf chip you can buy from mouser.com or digitek.com, AND if you know how to de-solder and solder delicate electronic components using a hot soldering iron WITHOUT destroying them or the adjacent components. if no identifying codes on the chip, maybe google up a schematic of the board (unlikely) and figure out what it is. if it's a proprietary chip made Rockford Fosgate, it will be harder to find. Also, there could be damage to OTHER components that may not be visible, so if you go to all this trouble it might still not work and then you'd have wasted money. hopefully you are under warranty and RF can repair it. otherwise, chunk it in the nearest trash can.