As part of initial condition inspection before airworthiness inspection next month, I started on multiple items: Vacuuming/cleaning cockpit floor, securing multiple nuts/bolts, torque witness paint as needed, lubrication of all moving parts, inspection of inside of fuselage, wings.
Also reconfirmed correct wiring connections for RS 232 between GDU-GEA 24, GNX-375-GSU 25. After panel put back, still shows error connection on GDU port 1 of RS-232. Will check for grounding short tomorrow.