As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INITIALLY AFTER TAKEOFF VERY LOUD NOISE COMING FROM FWD NOSE SECTION, ACCESS DOOR OPEN ON EICAS. PERFORM APPROPRIATE CHECKLIST, DECLARED EMER. PERFORMED GEAR SWING & FOUND NOSE GEAR DOORS DID NOT CLOSE. FOUND BAD NOSE GEAR SEQUENCE PROX SWITCH WITH GSE212. R & R NOSE GEAR DOOR SEQUENCE PROX SWITCH IAW AMM 32-63-03. OPERATIONS CHECKED GOOD. SEE ITEM 2 BELOW FOR ACCESS DOOR OPEN. FWD ELEC COMPARTMENT DOOR INDICATION CHECKED GOOD IAW AMM 52-71-00.