Good list. I'd add one that bit us hard last year: the brake disc wear inspection on the servo motor itself.
Most people check the holding brake function (does it hold the slide when power is off) but never measure the actual disc thickness. Our Yaskawa SGMGV motors spec a minimum disc thickness of 3.2mm — ours had worn to 2.1mm over 6 years. Brake still "worked" in the sense that it held the slide stationary, but the holding torque had degraded about 40%. During a power failure with the slide at mid-stroke carrying a 180T die, the slide crept down 0.8mm before the brake fully engaged. Nobody got hurt but it could have been ugly.
Now we measure brake disc thickness every 12 months with the motor pulled. Takes an extra hour during the annual teardown but it's cheap insurance. Yaskawa doesn't even mention this in their standard maintenance schedule — had to dig it out of the detailed service manual.
The other one I'd flag: check your encoder battery voltage even if the drive shows no alarm. The low-battery warning threshold on most drives is set at 2.8V, but we've seen batteries at 2.9V that couldn't hold the multi-turn counter through a 3-day holiday shutdown. We replace all encoder batteries annually in December regardless of voltage. $8 per battery vs a $2,000 re-homing procedure if you lose position.