Replace main and counter operation drive belts.

Check and adjust or replace spindle belts as necessary.

Lubricate elements according to service manual.

Check and replace relays as necessary.

Replace batteries for amplifier and numerical control.

Replace air filter and pressure reducer filter.

Check and replenish oil level in spindle/counter spindle.

Check status/version of software; update if necessary.

Check fans.

Check safety switches.

Check and adjust alignment of all axes.