As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) GEAR DISAGREE ON UP SELECTION AFTER T/O. NOISE IN FLT DECK CONFORMING NOSE GEAR NOT RETRACTED (INDICATED RED HATCHING ON EICAS CHECK- LIST CARRIED OUT GEAR INDICATED 3 GREEN AIRCRAFT RETURNED TO AIRPORT. DOOR SELECTOR VALVE REPLACED IAW AMM 32-22-15-400-801. A/C SERVICEABLE.