As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SEA FLIGHT NR 2377: LANDING GEAR DID NOT RETRACT AFTER TAKE-OFF. AIRCRAFT RETURNED TO FIELD. MAINTENANCE REMOVED SAFETY WIRE FROM TOP 2 BOLTS AND REMOVED BOLTS TO LOWER COVER ASSEMBLY. REMOVED AND REPLACED NOSE GEAR PROX SENSOR COVER. INSTALLED NEW GROUNDING WARNING PLACARD. AIRCRAFT RETURNED TO SERVICE.