2004 Chevy Colorado Ext. Cab Z71 4x4

I have an '04 Colorado that I bought with 4800 miles. So far, the dealer has had to replace the left front axle seal after I noticed fluid on my garage floor. I have a "Service Engine" light flashing and staying on when I drive the truck. The dealer has ordered valve springs for it. I'm waiting on them to call me to bring it in. Right now they have another Colorado with the same problem. They ordered valve springs for his truck and started to put them in and found that his camshaft was scared. So, they had to order another camshaft. His truck has been with them for 27 days. Now that they have the camshaft in, hopefully they can get this gentleman his truck back.