As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED APU OIL PRESSURE AMBER CAS MESSAGE IN FLIGHT EN ROUTE FROM CLT TO XNA. CREW DIVERTED TO TYS BECAUSE RIGHT GENERATOR WAS DEFERRED AND LANDED WITHOUT INCIDENT. MAINTENANCE INSPECTED AND FOUND NO FAULTS IN APU ECU (ELECTRONIC CONTROL UNIT). MAINTENANCE REMOVED, CLEANED AND REINSTALLED LOP (LOW OIL PRESSURE) SWITCH CONNECTOR AND PERFORMED CHECKS USING AIRCRAFT MAINTENANCE MANUALS. AIRCRAFT WAS RELEASED FOR SERVICE.