What was found
FUEL LEAK ICAS MESSAGE ANNUNCIATION 10 MIN BEFORE INITIAL DESCENT. MONITORED FUEL FOR 15 MIN & NOTED A 150 LB LOW IMBALANCE IN LT WING. REBALANCED FUEL & AFTER AN ADDITIONAL 15 MIN, NOTED ANOTHER 150 LB LOW IMBALANCE IN LT WING. TAXIED ONTO RAMP FUEL LEAKING FROM VENT IN BOTTOM OF LT ENGINE. FOUND FUEL LEAKING FROM LINE AT HMU FROM FUEL/OIL HEAT EXCHANGER. 1 ATTACH BOLT MISSING & OTHER ATTACH BOLT LOOSE, ALLOWING FUEL LINE TO BE DISCONNECTED FROM HMU. INSPECTED LINE & NO DAMAGE NOTED. INSTALLED NEW O-RING ON LINE & INSTALLED ON HMU USING NEW BOLTS. OPS & LEAK CHECK GOOD. WORK PERFORMED IAW MM 73-10-01.