A B737 WAS DISPATCHED IN NON COMPLIANCE WITH THE INCORRECT STANDBY PWR MODULE INSTALLED.

Narrative

THE PROB AROSE FROM A REPETITIVE #1 CSD OIL TEMP HIGH DISCREPANCY WHEREAS THE #1 CSD WAS REMOVED AND REPLACED JUST A FEW DAYS PRIOR TO ANY MAINT THAT I PERFORMED. THE REPLACEMENT CSD DID NOT FIX THE PROB. THE ACFT THEN CAME TO ZZZ ON THE NIGHT IN QUESTION WITH THE SAME DISCREPANCY. AFTER AN ENG RUN IT WAS COLLECTIVELY DECIDED THAT WE WOULD CHANGE THE #1 CSD OIL COLLAR; #1 CSD OIL TEMP INDICTOR; AND THE STAND-BY PWR MODULE. ALL THE ITEMS WERE CHANGED SIMULTANEOUSLY DUE TO NOISE RESTR REQUIREMENTS AT NIGHT FOR THE HIGH PWR ENG RUN AND TIME CONSTRAINTS FOR MORNING DEP. AFTER CHANGING THE CSD OIL COOLER; ANOTHER MECH AND I WENT TO THE MAINT OFFICE TO GET THE REPLACEMENT CSD OIL TEMP INDICATOR AND STAND-BY PWR MODULE. AT THE MAINT DESK WHERE THE RON ACFT LOGBOOKS AND WORK PACKAGES ARE KEPT WAS A STAND-BY PWR MODULE WAITING FOR US. WE TOOK THE MODULE (ASSUMING THAT WHOMEVER PULLED THE PART OFF THE STOCKROOM SHELF AND PUT IT IN THERE FOR US TO USE ON OUR ACFT HAD ALREADY VERIFIED EFFECTIVITY) AND A CSD OIL TEMP INDICATOR BACK TO THE ACFT WHERE WE REMOVED AND REPLACED BOTH PARTS. ALL INDICATIONS WERE NORMAL DURING THE SUBSEQUENT ENG RUN AND LEAK CHK AFTER THE MAINT WAS PERFORMED. APPARENTLY; THE QUALITY ASSURANCE DEPT FOUND THE IMPROPER PART NUMBER STAND-BY PWR MODULE AND IT WAS REMOVED AND REPLACED WITH THE CORRECT EFFECTIVITY STAND-BY PWR MODULE. IN ORDER TO PREVENT RECURRENCE I FEEL THAT I WILL HAVE TO 'DOUBLECHK' PART NUMBERS AND ACFT EFFECTIVITY WHEN GIVEN A PART TO INSTALL ON AN ACFT. I REALIZE THAT I; AS THE MECH; AM ULTIMATELY RESPONSIBLE FOR THE CORRECT INSTALLATION OF THE CORRECT PARTS ON THE ACFT BUT FUTURE INCIDENTS MAY BE PREVENTED BY SOME ADDITIONAL FORM OF DIFFERENTIATION ON PARTS THAT LOOK SIMILAR BUT ARE NOT. INCREASED MECH AWARENESS (SUCH AS I HAVE OBTAINED FROM THIS INCIDENT) WILL ALSO AID IN THE PROPER MAINT PRACTICES OF OUR ACFT.