What was found
AIRCRAFT WAS GROUNDED: ENGINE OIL DECREASED DURING FLIGHT. #2 ENGINE FROM 9 QTS AT CRUISE DOWN TO 4 QTS. DECISION MADE TO DIVERT TO MSY. EMERGENCY DECLARED. TEMPERATURE AND PRESSURE NORMAL THROUGHOUT. OIL QUANTITY AS LOW AS 2 QTS ON APPROACH. FOUND OIL LEAK AT THE SCAVENGE OIL FILTER RETURN LINE AND CLOGGING TRANSMITTER BASE. REMOVED AND REPLACE TRANSMITTER (AALA202105019001) IAW AMM 79-21-07. REMOVED AND REPLACED BOTH SEALS (AALA202105039010) AT OIL RETURN LINE IAW AMM 79-21-04.