Hello I have a few questions about my 1995 Cadillac Eldorado ETC I inherited from my father after his passing. This was dad's baby, so therefore I wanna make sure it stays pristine like he left it. It has 80k miles and is in great shape. It's never had a tune-up or fuel filter replacement so I’m sure it’s long overdue for one correct? Also what’s with the service ride control message that keeps appearing? Thanks in advance!