Completed the P.M.. checked wiring and connections. Checked drain lines. Checked the air filter. Checked unit operation. During the p.m. found that the unit was losing the control voltage signal to the outside unit. Change the wire and tested the unit. Contactor know longer chatters. Found unit than going out on low pressure even with a full refrigerate charge. Jumped out the low pressure switch and got unit to run until it goes out on high head pressure. Customer needs a price for a new fan motor, blade and a low pressure switch. Would also like a price on a new outside unit.