My Prius is a '05 with 275K on the clock. The wife was driving it to work the other morning and the A/C stopped working, boy was she pissed. Anyways, after previewing some of the threads on how to fix a broken A/C, I stumbled upon a thread that said the inverter pump might be bad and thus force shutting down the A/C compressor in order to keep the Inverter alive until repairs can be done. So this morning I replaced the Inverter pump and started the Prius up to see if this fixed the no A/C problem. While running the engine I did notice a weird sound coming from the passenger side of the engine bay. It wasn't a grinding noise but similar, kinda a brrrrrrrr noise. This got me thinking about if my A/C compressor is dead. So I tripped on over to PriusChat and begin reviewing threads about Compressor failure and one fellow posted something that piqued my interest. He stated that DTCs could be retrieved by pressing a couple of buttons on the steering wheel and then press the start button a couple of time and the DTCs will appear on the MFD. Thus, now I come to the smart guys on this forum who have the knowledge of the Prius Gods and am humbly asking for your assistance. Could you tell me what DTC 21, 42, and 76 mean? Thanks.