2007 freightliner m2 roll off truck

2007 freightliner m2 6 speed allison transmission mercades diesel engine has a dumpster standard rail roll off unit on the back. We drove truck ruffly 10 miles down road recently after being parked a extended duration. It shifts and seems to run ok. Has check engine light on currently. Pto engages, bed works but the if u use tarp function it has a leak in one of the lines. Comes with the flat skid currently on the back of it. It is 22ft long. Will assist with loading if getting it transported.