If my psp got wet and shorted out what parts do i probalby need to get replaced?

all of them, i would run it over with a car and say it fell out of your pocket and sony MIGHT replace it, but make sure if you have a memory card to take it out first, obviously

yes get the warranty or buy a new one when its fixed glitches will appear

Try taking all the body apart and letting the board dry out for a day or two while it is exposed to the air. It might not be broken, just shorted if there is still some water on the boards that can't evaporate cause it's closed inside the tight body.

find someone who can fix a PSP and see if they can take it apart and find out what parts need repair.I did a little search, and found an overnight PSP repair, http://www.missionrepair.com/default.asp?gclid=CLzYh87SupQCFQguHgod-m2tTA and a professional in Oklahoma City here http://www.xboxrepairservice.com/psp.html but if you don't like my results, then search some more, like I said, did a little search.