As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED AN APU OIL PRESSURE CAS MESSAGE AT FL 310 AFTER DEPARTURE FROM TYS. THE AIRCRAFT DIVERTED TO CLT AND LANDED WITHOUT INCIDENT. MAINTENANCE REMOVED AND REPLACED THE APU LOW OIL PRESSURE (LOP) SWITCH AND PERFORMED CHECKS PER THE AIRCRAFT MAINTENANCE MANUAL. AIRCRAFT WAS RELEASED FOR SERVICE.