As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED AT FL310 GOT AMBER "APU OIL PRESS" CAS FOLLOWED AMBER "APU OIL TEMP" CAS MSG. AIRCRAFT DIVERTED TO DAY AND LANDED WITHOUT INCIDENT. MAINTENANCE FOUND APU OIL COOLER OBSTRUCTED AND REMOVED AND REPLACED THE APU OIL COOLER PER THE AIRCRAFT MAINTENANCE MANUAL. CHECKS WERE MADE PER THE AIRCRAFT MAINTENANCE MANUAL AND AIRCRAFT WAS RELEASED FOR SERVICE.