AN AIRLINE MECHANIC PERFORMING CONTRACT MAINT WORK ON ANOTHER CARRIER'S B767-400 ETOPS ACFT; RELEASES THEIR ACFT WITHOUT ACCOMPLISHING A REQUIRED RII INSPECTION.

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ACFT ARRIVED WITH PLT WRITE-UP: 'AFTER TKOF; GEAR LEVER WOULD NOT MOVE TO THE UP POS; USED LOCK OVERRIDE BUTTON PER QRH TO MOVE GEAR LEVER TO THE UP POS; GEAR THEN RETRACTED WITHOUT FURTHER INCIDENT. ALL OTHER SYS OPERATING NORMALLY.' I CONTACTED ACR X'S MAINT CTL FOR TROUBLESHOOTING GUIDANCE. I THEN PROCEEDED TO BITE CHK THE PROX SWITCH ELECTRONICS UNIT; CARRIED OUT TARGET TESTS ON ALL LNDG GEAR PROX SENSORS; INCLUDING THE LNDG GEAR TILT SWITCHES. AFTER TROUBLESHOOTING AND NO DEFECTS FOUND; I THEN CALLED BACK ACR X'S MAINT CTL TO INFORM THEM OF MY FINDINGS. I TOLD THEM I COULD NOT FIND A FAULT IN THE SYS AND I WAS HAPPY TO RELEASE THE ACFT. THEY AGREED. WE THEN PROCEEDED TO THE ETOPS CHK FOR WHICH ACFT X'S MAINT CTL PROVIDED ME WITH AN ETOPS CTL NUMBER TO RELEASE THE ACFT FOR THE RETURN ETOPS FLT. I AM AN ACR Y EMPLOYEE. WE CARRY OUT CONTRACT MAINT FOR ACR X. IN COMPARISON WITH THE ACR Y RII LIST; ACR X'S RII LISTING IS QUITE EXTENSIVE AND UPDATED/CHANGED REGULARLY. I WOULD RECOMMEND BI-WKLY OR WKLY CHKS TO KEEP AMT'S INFORMED OF THE RII LISTING. ALSO; ACR X'S MAINT CTL SHOULD BE AWARE OF LATEST RII LIST UPDATES AND INFORM ALL MAINT PERSONNEL BEFORE ISSUING ETOPS CTL NUMBERS. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: REPORTER STATED THE CARRIER HE WAS PERFORMING CONTRACT MAINT ON HAD RECENTLY MADE CHANGES TO THEIR MEL PROCEDURES MANUAL. IN THE SECTION PERTAINING TO THE LANDING GEAR LEVER; AT THE BOTTOM OF THIS MEL PAGE; WHERE THE STATEMENT READS 'NO TROUBLES FOUND;' NO OTHER PROCEDURE IS NOTED AS REQUIRED FOR RELEASE TO SERVICE. ONLY PROBLEM WAS; ON THE VERY NEXT PAGE; THERE WAS ADDITIONAL LANGUAGE REQUIRING AN RII INSPECTION; EVEN IF THE 'NO TROUBLES FOUND' STATEMENT WAS APPLICABLE. THIS SPECIFIC RII LANGUAGE WAS ONE OF THE ADDED CHANGES TO THE MEL AND EVEN THE MAINT CONTROLLER FOR THE CARRIER ACFT HE WAS WORKING ON WAS NOT AWARE OF THE LANGUAGE ON THE FOLLOWING PAGE. WITHOUT ANY 'NOTE' SUCH AS; 'CONTINUED ON FOLLOWING PAGE;' THE RII REQUIREMENT WAS NEVER ACCOMPLISHED PRIOR TO ETOPS RELEASE. REPORTER ALSO STATED BOTH CARRIERS HAVE REVIEWED THEIR PRACTICES TO ADDRESS THE MEL ISSUE AND RELEASE PROCEDURES.