What maintenance is needed on FHA gas heater?

Hi,
I have a 10 year old FHA gas heater. I change the filter on a regular basis but I was wonderring if there is some annual maintenance I should be doing. Do I need to lube the blower fan? Do I need to clean out anywhere?
Thanks in advance for any help.
Gary

The motor may have oil cups; you could tell by looking. You should have the manual, but I realize that often we do not inherit such things when we buy a house. Try contacting the manufacturer for a maintenance manual.