A B767-300 WAS DISPATCHED IN NON COMPLIANCE WITH THE #2 THRUST REVERSER INOP PER THE MEL BUT SPECIAL PROCS NOT ACCOMPLISHED.

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AT APPROX XA00 ON AUG/XA/99; MECH A AND MYSELF DISCOVERED INDICATION PROBS WITH THE R THRUST REVERSER ON ACR ACFT NUMBER XYZ. WE TRIED CYCLING THE R THRUST REVERSER AND THE INDICATION PROBS PERSISTED. THE R ENG THRUST REVERSER NEEDED TO BE LOCKED OUT. I BRIEFLY SCANNED THE MEL FOR THE THRUST REVERSER AND STARTED PULLING CIRCUIT BREAKERS FOR THE APPLICABLE ENG THRUST REVERSER. THE MEL LISTED NUMEROUS CIRCUIT BREAKERS FOR THE DIFFERENT ENG CONFIGNS. I FOUND ONLY 2 OF THE CIRCUIT BREAKERS ON THE ACFT THAT WERE LISTED IN THE MEL AND PULLED THEM. NEXT; I REMOVED 1 STOW VALVE DEACTIVATION PIN FROM THE COCKPIT BULB LOCKER AND PROCEEDED DOWNSTAIRS TOWARDS THE R ENG. UPON ARRIVING AT THE R ENG; I OBSERVED MECHS A AND B FINISHING THE INSTALLATION OF THE DEACTIVATION PINS IN THE THRUST REVERSER HALVES. I THEN INSTALLED THE PIN; I HAD OBTAINED EARLIER; IN THE DEACTIVATION SIDE OF THE STOW VALVE AND SECURED IT WITH LOCK WIRE. MECH B AND I THEN PROCEEDED UPSTAIRS. WHEN WE ARRIVED UPSTAIRS AND MECH A WAS SIGNING OFF THE ACFT LOGBOOK; I QUESTIONED BOTH OF THEM IF THE CIRCUIT BREAKERS FOR THE THRUST REVERSER; I PULLED EARLIER; NEEDED TO BE SECURED OR RESET FOR FLT. WE LOOKED AT THE FIRST COUPLE LINES OF THE MEL THAT TALKED ABOUT PULLING AND SECURING THE CIRCUIT BREAKERS AND A NOTE THAT SAID TO RESET THE CIRCUIT BREAKERS. WE DECIDED THE CIRCUIT BREAKERS NEEDED TO BE RESET. I RETURNED TO THE COCKPIT TO RESET THE CIRCUIT BREAKERS. WE RETURNED TO THE MAINT OFFICE AND THE ACFT DEPARTED FOR ABC WITHOUT INCIDENT. DURING MY NEXT SHIFT; DURING THE EVENING OF AUG/XB/99; MY LEAD MECH RECEIVED A CALL FROM ABC AND NOTIFIED ME THE SAME ACFT WAS NOW IN XXV. HE SAID THE ACFT THRUST REVERSER HANDLE WAS PULLED AND THE R THRUST REVERSER DEPLOYED AND WAS DAMAGED. HE ALSO SAID MAINT PERSONNEL DISCOVERED THE MOTORIZED ISOLATION VALVE WAS NOT LOCKED OUT AND A CANNON PLUG WAS NOT DISCONNECTED AND STOWED AS CALLED OUT IN THE MEL FOR THE THRUST REVERSER. I WAS SHOCKED AND DID NOT RECALL THE MEL SAYING ANYTHING ABOUT THE MOTORIZED ISOLATION VALVE AND STOWAGE OF A CANNON PLUG. I THEN PULLED UP THE MEL AND DISCOVERED IT INDEED CALLED FOR THE DEACTIVATION OF THE MOTORIZED ISOLATION VALVE AND THE DISCONNECTION AND STOWING OF A CANNON PLUG. THERE WAS ALSO A MORE PRECISE STATEMENT ABOUT RESETTING THE CIRCUIT BREAKERS TOWARDS THE END OF THE PROC THAT I HAD ALSO MISSED. LOOKING BACK; I REALIZED I DID NOT COMPLETELY READ AND UNDERSTAND THE MEL FOR THE THRUST REVERSER BEFORE ASSISTING IN THIS OP. I ONLY BRIEFLY SCANNED THE PROC. I DON'T KNOW IF MECHS A AND B HAD PERCEIVED I HAD PERFORMED THESE MISSED STEPS OR NOT. BUT; ON THE SAME NOTE; I DID NOT SEE MECHS A AND B COMPLETELY READ THE MEL PROC EITHER. I DID NOT SIGN THE ITEM OFF IN THE ACFT LOGBOOK. I WAS NOT ASKED WHAT STEPS I HAD PERFORMED. I WAS NOT ASKED TO DO ANY SPECIFIC STEPS OF THE MEL THRUST REVERSER PROC FOR ACFT XYZ ON AUG/SUN/99.