treff

need some help!
I was out on the lake last weekend for about 30 mins. and one motor shut off on me..tried to start it back up and it was making a weird noise so i finally got ti taken out and took the intake off to look at the rotory valve and the valve has a nick in it!
there is a small part of the block that is scared up alittle..
should i trash the block,motor, and get a new one ?! or just replace the valve and see what happens?!
Im scared this could cost lots of $$$$$.
what should I do?
Also ..whats a good site to get seadoo parts?
thanks Tom
here are some pics..

I was looking at my boat today and it looks like the seats are starting to mildew (i thinks its mildew) on the top of the backrest.. Just a few spots ..any sugg how to clean it..


Thanks Tom