My son just purchased a 1981 Bayliner Eagle (19.5' ski boat) It has a 470 mercruiser I/O. This may sound like a dumb question but where do you check the hydraulic fluid for the tilt/trim? We have the oil changed, engine flushed, rear drive fluid replaced but can't seem to spot the tilt hyd fluid. It is starting and idling well. The drive is engaging in both reverse and forward. About ready to put it in the water but wanted to ensure the hyd fluid is OK. Thanks in advance