What was found
DURING CLIMBOUT PASSING 12000 FT, THE GREEN NR 2 THRUST REVERSER LIGHT CAME ON AND THE ECAM INDICATED ENGINE REVERSER UNLOCKED. COMPLIED WITH ECAM PROCEDURE AND REVERSER LIGHT EXTINGUISHED AFTER NR 2 THROTTLE WAS PULLED TO IDLE. CONTINUE QRH AND MEL REVIEW. SINCE MEL 78-30-01C DID NOT MENTION ECAM INDICATION AS ALLOWED, ELECTED TO RETURN TO KMEM. VERIFIED 78-30-01C WAS ACCOMPLISHED CORRECTLY. REMOVED AND REPLACED WIRE HARNESS 21W4140 PER AMM 71-51-01-4. REACTIVATED BOTH T/R HALVES. RESET CIRCUIT BREAKERS AND KEPT FAN COWLS OPEN TO FOM. PREFORMED NR 2 ENGINE T/R FUNCTIONAL TEST REF MM 78-31-00-5 06, OPS CHECKS GOOD. RAN ENGINE AT HIGH POWER NO FAULTS NOTED. SYSTEM OK FOR SERVICE.