What was found
DURING T/O ROLL PILOT NOTICED FUNNY ODOR IN CABIN SIMILAR TO OIL ODOR. A FEW SECONDS INTO CLIMBOUT, LAV SMOKE DETECTOR SOUNDED. A/C RETURNED TO FIELD AT PHL AND LANDED WITHOUT INCIDENT. MX INSPECTED A/C, PERFORMED GROUND RUNS AT ALL POWER SETTINGS WITH BLEEDS & PACKS ON. NO INDICATIONS OF SMOKE OR LAV SMOKE INDICATION. REMOVED AND REPLACED LAV SMOKE DETECTOR. A/C FERRIED TO IND FOR FURTHER EVALUATION. A THOROUGH INVESTIGATION AND CHECKS WERE PERFORMED ON THE A/C AND ENGINES, AND NR 1 ENGINE WAS CONFIRMED TO BE CAUSING THE ODORS. NR 1 ENGINE WAS REMOVED AND REPLACED PER TASK CARD CE720001. ENGINE RUNS ACCOMPLISHED, NO LEAKS AND NO ODORS NOTED IN CABIN. AIRCRAFT RETURNED TO SERVICE.