Follow these instructions to keep the ATF cooler cleaner working properly:
Replace the two magnetic nonbypass spin-on filters after every 20 hours of use, based on the hour meter, or when you notice a restriction in the ATF flow.
Check the level and condition of the fluid in the tank before each use.
Replace the ATF in the tank when it looks dark or dirty.

Online Reference Owner's Manual
This owner’s manual should be considered a permanent part of the
vehicle and should remain with the vehicle when it is sold.
This owner’s manual covers all models of your vehicle. You may find ...
Shift Fork Disassembly/Reassembly (M/T)
NOTE: Prior to reassembling, clean all the parts in solvent, dry them, and
apply MTF to all contact surfaces.
...
Intake Manifold/Chamber Assembly Removal and Installation
Exploded View
Removal
Remove the under-cowl panel.
Remove the air cleaner.
Disconnect the engine wire harness connectors, and remove the wire
harness c ...