As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 2273 - EWR-MKE - DURING FLIGHT, THE CREW GOT A LAVATORY SMOKE DETECTOR INDICATION AND NOTICED SMOKE IN THE COCKPIT. THE CREW DONNED THEIR 02 MASKS AND DIVERTED TO BUFFALO, NY. MAINTENANCE INSPECTED THE A/C AND FOUND THE RT ECS UNIT, COLD AIR UNIT, VIBRATING AND MAKING A LOUD GRINDING NOISE. MAINTENANCE REPLACED THE ECS AND WITH OPERATIONAL CHECKS GOOD THE A/C WAS RETURNED TO SERVICE. (M)