As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
A/C 1504 - ATB - RETURNED TO AMS DUE TO NR 2 ENGINE LOSS OF OIL QTY AND LOW OIL PRESSURE AFTER TAKEOFF. CONTACTED DISPATCH AND MCC, OIL PRESSURE NEVER GOT BELOW 11 PSI, REDUCED THROTTLE TO IDLE AND TO RETURN TO AMS; EMERGENCY DECLARED. CORRECTIVE ACTION: FOUND LUBE/SCAVENGE PUMP TGB SCREEN CLOGGED WITH SEAL MATERIAL. REPLACED LUBE/SCAVENGE PUMP AND FLUSHED OIL SYSTEM MULTIPLE TIMES. REMOVED BOOSTER FAN BLADES AND REPLACED NR 1 AIR/OIL SEAL AND REINSTALLED BOOSTER FAN BLADES.