MECHANIC NOTES HE MAY HAVE MISJUDGED A STALL REPORT FROM A FLT CREW AND DID NOT PERFORM AN ENGINE STALL INSPECTION BEFORE RETURNING ACFT TO SERVICE.

Narrative

ACFT RETURNED TO GATE AFTER A REJECTED TKOF WITH THE FOLLOWING IRREGULARITY: TKOF ROLL AFTER PUSHING TOGA BUTTON THERE WAS AN IMMEDIATE N1 DIFFERENTIAL. L N1 WENT TO APPROX 70%; R N1 LAGGED AROUND 40% N1. TKOF ROLL ABORTED AT APPROX 30 KTS. AFT FLT ATTENDANTS SAID THEY HEARD A LOUD BOOM IMMEDIATELY BEFORE ABORT. MY CORRECTION ACTION: INSPECTED #1 AND #2 ENGS; BOTH CHK GOOD. RAN ENGS TO TKOF PWR WITH AUTOTHROTTLE ENGAGED AND ALSO MANUALLY; BOTH CHK GOOD -- N1; N2; EGT MATCH. RAN AUTOTHROTTLE BITE TEST; NO FAULTS. TORQUE TEST SHOWS #2 TAKES 1.5 IN-OZ MORE TO MOVE THRUST LEVER THAN #1. FORWARD AUTOTHROTTLE TO MCO/PLACARD PER MEL 22-00-04. AFTER THE TROUBLESHOOTING; I COULD NOT FIND A PROB WITH THE PWR PLANTS AND THE AUTOTHROTTLE OP WAS FINE. I WAS INSTRUCTED BY OUR MAINT CTL CTR TO DEFER THE AUTOTHROTTLES PER MEL AS PRECAUTIONARY. I ASKED THE CAPT ABOUT THE FLT ATTENDANT'S RPT OF A LOUD BOOM. THE CAPT STATED VERBALLY THAT HE DID NOT HEAR A BOOM. I THEN DEDUCED THAT THERE WAS NO ENG STALL AND THE RPT WAS AN OVERREACTION OF THE FLT ATTENDANT. THE MAINT CTL CTR SET UP TO PERFORM A STALL INSPECTION THE NEXT DAY. THE REASON FOR THIS RPT IS THAT I MAY HAVE MISJUDGED THE STALL RPT AND DID NOT DO A STALL INSPECTION BEFORE I RETURNED THE ACFT TO SVC.