Dave, Look in 9A-34. It will guide you. Rebuilt units are available through Johnny Monzo, Dick Hussey or Tom Rohner. If your tower has NEVER been removed you will have to remove the 2 hard to get at bolts on the bottom. The top ones are easy and visible as soon as you remove the a/c vent. Most never put the bottom ones back since it holds OK without them. Good luck. Warren