As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING THE APPROACH THE LEFT MAIN AND LEFT ESSENTIAL BUS LIGHT ILLUMINATED. CREW FOLLOWED THE QRH. DURING GEAR EXTENSION ONLY GOT GREEN FOR NOSE GEAR, FOLLOWED CHECKLIST TO DO MANUAL GEAR EXTENSION AND DECLARED EMERGENCY. LANDED WITHOUT FURTHER INCIDENT BUT NEEDED TO BE TOWED TO THE GATE. REMOVED AND REPLACED LEFT PDU OPS CHECKED GOOD. FERRIED TO ALB FOR EXPLOSIVE BOLT CHANGE. (NOTE SUBMITTED IN ERROR AS NSVA2011012)