Performed maintenance on a 2006 Goodman furnace. Systems temperature split is good at 32. Combustion motor amping close to max specification but still in range at this time. System does not have a condensate switch or a service port. Ignitor is in range. Flame sensor was cleaned. Blower compartment has significant dust build up, I cleaned the walls of the compartment. The blower housing and fan blades are very dirty. Blower motor looks is free from any oil leak and is amping ok. Homeowner is using washable filters and is on a good cleaning regiment.