What was found
AFTER TAKEOFF ON FLIGHT NR 2724, RT ENGINE OIL PRESSURE LIGHT ILLUMINATED. OIL PRESSURE APPROXIMATELY 10-20 RETURNED FOR LANDING AT ALO DID NOT SHUT ENGINE DOWN. AIR RETURN TO ALO. MAINTENANCE INSPECTED OIL LEVEL, FOUND TO NEED 3.5 QTS OF OIL RAN A/C AT CRUISE POWER FOR 30 MNUTES IN CHECKED OIL LEVEL AGAIN, AND WAS 3/5 QTS LOW. A/C WAS PARKED NO FERRY. MAINTENANCE REMOVED AND REPLACED RT ENGINE PN ON/OFF CT7-5A2, SN/ON GE-E367387, SN/OFF GE-E367283 IAW J/C 7100-301 FOR OPS AND LEAK CHECK GOOD.