Performed annual heating maintenance on a mobile home furnace laundry room. Client said airflow to master bedroom seems weaker than normal, went under home found air leaking out of plenum. Sealed unit from inside, Put it all back together and tested system. System working at this time. Tested system blower capacitor 7.5 ok electrical looks ok no loose connections. Board ok no burnt wires. System working well at this time. Hot surface ignitor ok. Signing back up for another year of services