Complied with 100 Hour Inspection as Required. All ADs have been Verified Current and Complied with refer to Current AD Compliance Report dated 9Sep19. R&R Pilot's seat with serviceable, sent original seat out for reupholstery. R&R back bench seat w/serviceable seat that was robbed from A/C N5378GT, sent original back seat out also for re-upholstery. R&R Central Air Filter w/new P/N AA09-18-1. Next due @ Tach Time 5085.2. Cleaned, sanded, treated w/zinc phosphate left flap upper access panels. R&R dome light cover w/new P/N 0511320-2. R&R left hand step w/new P/N 0713PH3. R&R all four pulleys at baggage compartment w/new P/N MC5378-3. Cleaned, sanded, treated w/zinc phosphate and painted to match right side of Vertical/Horizontal Stab at elevator trim of surface corrosion. Cleaned belly of residual oil. All work done IAW Cessna C172M 100 Hour checklist. I Certify this Aircraft was Inspected IAW A 100HR