Do you know the print count on the current drum as well as total print count on the printer.
You can probably lube up the opposite side of where the gears are on rollers.
this isn't a laser but you can see where the gears are, and the shaft goes to the other side of the printer where it sits in a bushing, the bushing wears out and you can get squeaking, and lubing it up with some lithium grease may quiet it for a bit but it will probably start to squeak again.