Pulse Width Modulator
This is the only right answer.
But it doesn't make sense in this context.
I have been trying to figure out if the P could be for something like Pre-sale?
If evolution is a myth and Adam and Eve were the first people, which one was black, which one was white and which one was asian?
What about Native American? They are not black, white nor asian. While we're at it what about Eskimo? What race are they anyway?
Yeah, that's exactly what I asked the Pope. Then he went and quit.
"Post Warranty Maintenance?"
But RMA's are only for outright defective (DOA) products. Or other accepted reasons for return/exchange.
Product warranties aren't honored by the retailer, except in some select cases (say, auto parts). You must go through the manufacturer (or perhaps more accurately, just 'the name on the box') to return something that fails within its stated warranty period.
Besides, if someone is out of warranty, what is the reseller going to do besides offer to sell you another one at full price? Is this a place with a repair facility?