Check the pinion counterweight assemblies, especially the safety wires. There should be no free play. There are four linear bushing assemblies. Repeat this procedure for each. Note any damaged bellows.
Slide bellows out of the way to inspect linear shafts.
Shafts should be clean, rust-free, and covered with a thin film of oil. Burnished lines running the length of the shaft are normal, but they should not be deep enough to feel with a fingernail. Wipe up any excess oil at the shaft ends. Replace any damaged hose clamps.