As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED DUE TO: APU FAILED IN FLIGHT COULD NOT PROVIDED ENOUGH ELECTRICAL POWER WITH AN ENGINE GENERATOR ALREADY ON MEL. AIRCRAFT DIVERTED TO AND LANDED SAFELY AT MIA.PARTIAL WORK ACCOMPLISHED BITE CHECK OF THE ECU FOUND MESAGE 49-91007 APU NO OIL PRESSURE. PER TSI 0122776 REQUIRE APU CHANGE. REMOVED AND REPLACED APU, PER JOB CARD 08L30049001.