As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) APU OIL TEMP CAUTION MESSAGE POSTED ON EICAS IN FLIGHT, WITH APU OPERATING BECAUSE IDG NR 1 WAS DEFERRED. CREW DECLARED AN EMERGENCY LANDING AND MADE AN UNSCHEDULED LANDING.INSPECTED APU AND FOUND IT LOW ON OIL. SERVICED WITH ON QUART OF OIL. AIRCRAFT BACK IN SERVICE.