Performed heating maintenance on a Goodman package system. Refrigerant level was under spec and defrost board has colorations around transistor, give estimate for 410a refrigerant and defrost board with parts still under warranty. Found emergency heat strips was turned off, customer prefer it would stay that way. Vacuumed inside electrical panel, washed outdoor coil, and tightened all electrical wirings. System is operational at this time but see recommendations for system efficiency and prevention of future issues.