Need Help With A Squek In The Engine.

[Bigdrockin]

My 08 Silverado crew cab has a squeek coming from the engine. All of the fluids are at the proper levels. I pulled both belts off and started the truck the squek continues. It is not a typical lifter tick, this is an annoying squeek. I noticed it a couple of days ago then it went away. Thinking it was mud in a pulley from the strip mine I work at I ignored it. But it came back tonight even worse. Any help would be appreciated.