HPOP res leaking down
 

I had to have the front cover changed on the 7.3. but now that I have it home I have a slow start issue I have found that the HPOP res is empty overnight.
I also had the lpop changed at the same time. I know when it was put on it was packed with what looked like red grease, could this a caused an injector O-ring to blow? I have noticed when I picked it up at the shop that the oil pressure was about 2-3 psi higher than it is now, (probably from the grease in the system?)I have unhooked the DS line to the head ( no oil was in the line)and put a fitting and hose on it and filled it with oil and refilled the res.to see if it is the DS side , or front cover leaking next I will do the PS if the res leaks down. It just seems odd that I did not have any leak down problems before the front cover change?
the new cover part # is for 99-03 (I had them return the oild one to me.so I checked both #'s on the covers) is the only diffarnce in the cover the filter screen?