As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING GEAR RETRACTION, CREW HEARD A RUMBLING NOISE FROM THE NOSE AREA & RECEIVED GEAR DISAGREE WARNING. CREW COMPLIED WITH AOM VOL 1 PROCEDURES, DECLARED AN EMERGENCY & RETURNED WITHOUT INCIDENT. R & R NR 3 PRIORITY BALANCED RELIEF VALVE IAW AMM 29-12-05. OPS CHECKED GOOD IAW AMM 29-12-05. GEAR EXTENSION & RETRACTION GOOD IAW AMM 32-30-00.