Sometimes, not all the time, when I reverse and the three amigos wiil come on (only when it squeals) it doesn't squal all the time. They will remain on until I turn the truck off but when I restart it they are gone, I'm thinking its the rear brakes needing to changed but I took a tire off and there appears to be plenty of pad left. Anybody have similar situation?

PS Mike Im going to need to talk to about seafoaming before it goes to shop for service, just to make sure I do it correctly.

 

If your brakes squel then there is a problem that needs looking at.
If I remember right the number 1 reason the three lights come on is because of worn brake pads.
So even though they look good you still might need new ones.
Did you check both sides? Maybe one of your pads shifted and is loose causing the noise.