What was found
"WARN ELEX" ON STATUS PAGE DURING PREFLIGHT TROUBLESHOOTING PER B767 FIM 27-32 FT803, WITH IRU'S ALIGNED THE WARN ELEX MSG CLEARS BUT PER BLK 2 WHEN THE LEFT STALL WARNING SWITCH IS TOGGLED THERE IS NO STICK SHACKER AND "WARN ELEX" APPEARS ON THE STATUS PAGE. ON THE LEFT WEU MODULE FAULT CODE 27 IS SHOWING WILL NOT CLEAR. ON THE RIGHT WEU MODULE ALL DIGITS ARE SHOWING. RESET BOTH WARN ELEX C/B'S STATUS MESSAGE CLEARS BUT RETURNS WHEN LEFT STALL WARNING TEST SWITCH IS TRIED TRIED NEW STALL WARNING CARD IN THE LEFT & RIGHT POSITIONS, LEFT STICK SHAKER WILL NOT ACTIVATE, PLI DOES OPERATE ALL OTHER INDICATIONS WERE NORMAL PER B767 AMM 27-32-01-4. REINSTALLED ORIGINAL STALL WARNING CARDS BOTH CHECK NORMAL EXCEPT FOR THE LEFT SIDE NOT SHAKING THE COLUMN. ON THE DOOR OF WARNING ELECTRONICS PANEL P51 THE PLACARD STATES THAT CODE 27 IS NORMAL FOR B767-300. BOTH CARDS NOW SHOW CODE 27. NEEDS FURTHER TROUBLESHOOTING. REMOVED & REPLACED THE LEFT CONTROL COLUMN SHAKER PER B767 AMM 27-32-05-4. ALL TESTS PASS ON THE LEFT STICK SHAKER SYSTEM AND ALSO CHECKED THE LEFT/ RIGHT SYSTEMS PER B767 OPERATIONAL TEST- STALL WARNING SYSTEM 27-32-00-5-3 ALL TESTS PASS. A/C OK FOR SERVICE. SDR INFORMATION REMOVED PART NAME: CONTROL COLUMN SHAKER REMOVED PART NUMBER: C-07202-3 S/N 145164A-06 MFG NAME: SAFE FLIGHT INSTALLED PART NUMBER: C-07202-3 S/N 404