As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLYING, CREW RECEIVED PARKING BRAKE NOT RELEASED MESSAGE. CREW RAN QRH, DECLARED AN EMERGENCY AND DIVERTED. WITH EMERGENCY VEHICLES STANDING BY AND PASSENGERS BRACING, CREW LANDED WITHOUT INCIDENT. CREW TAXIED TO GATE WHERE PASSENGERS DEPLANNED NORMALLY. MAINTENANCE TROUBLESHOT, R & R GEN I/O IN MAU 2 & 3 SLOTS 9 & 10 IAW AMM AND OPS CHECKED GOOD. ACFT IS GOOD FOR SERVICE.