As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 1206 - RDU-PIT, AT 50S OF PIT, CRWE GOT 'EMERGENCY DC BUS FAILED' ON MFDU. COMMUNICATINOS WERE LOST WITH ZOB AND PIT APPROACH. AIRCRAFT SHED SOME ELECTRICAL LOAD AND COMMUNICATION WAS RE-ESTABLISHED. AN EMERGENCY WAS DECLARED AND FLIGHT LANDED WITHOUT INCIDENT. MAINTENANCE FOUND GROUND HANDLING DC BUS BLOCKING DIODE CR3 OVERHEATED. REPLACED CR3. OPERATIONAL CHECKED GOOD. (M)