Things like this can take some time. Was the unit sitting out side for the year or inside. Were mice able to get to it. If so you may have some...
Check turbo. Pull off intake pipe to turbo and see if fins are hitting the housing. if so replace before you have a costly failure. Check for any...
Were both the lines return or was one supply. Reason i ask is make sure lines are tight. If one is supply and it got cracked or is loose it is...