Serpentine belt - and what else?

[fowl_play]

Help! I'm a brand-new '03 7.3l PSD owner and am not familiar with repairs on it yet... here's the skinny:

I was driving down the highway on Friday when I suddenly lost power steering and brakes and the battery light came on. I made it to the next exit and down the road to my brother's house. We were in a hurry to head to Wisconsin for a wedding and I didn't have time to troubleshoot anything - so in two minutes I noticed that:

1. The serpentine belt was off and hanging loose in the engine compartment (but I couldn't tell if it was damaged), and

2. There was fluid dripping from the driver's side of the engine compartment and it looked like it originated from the yellow cap on the driver's side (top) of the engine compartment where it looked like it blew out while I was driving.

I'll be back to Michigan in an hour and have limited time to get this fixed -- is there someone out there that can tell me what I should check, and whether just worrying about getting the serpentine belt back on for now is enough? Should I check something specifically to make sure I didn't lose too much fluid? Could anything else be broken which could have caused this?

Sorry for the stupid questions - I'm a newbie!

[fowl_play]

It's a 2003 F350 7.3L PSD...crew cab, SRW...

[dhanna6powerstroke]

More than likely the idler pulley bearing let go and the pulley turned sideways throwing the belt off. The fluid is probably power steering fluid that was forced out of the reservoir while driving with the belt off. Install new idler and/or tensioner if bad, new belt and top off power steering fluid and you should be good.