What was found
STRONG ELECTRICAL FUMES IN FLIGHT DECK. THIN SMOKE PLUME COMING FROM CAPTAIN'S YOKE BEHIND FLIGHT NUMBER INDICATOR. GROUNDED - YES. REMOVED AND DISASSEMBLED CA'S FLIGHT REMINDER, FINDING BURN MARKS WITHIN ASSEMBLY CASE. INSPECTED AND VERIFIED NO DEFECTS TO SHIP'S WIRING OR TERMINALS REF. B737-900 AMM 20-60-03 AND 20-60-04. REF. B737-900 WDM 33-11-11: VERIFIED THAT ASSEMBLY WAS CORRECTLY WIRED. CONFIRMED SOURCE OF DEFECT TO BE WITHIN L728 ASSEMBLY ONLY. NEW CONTROL COLUMN MEMORY DEVICE INSTALLED PER AMM 33-11-00. OPERATIONAL CHECKS OK. DISTRESSED DEVICE WHILE OPERATING WHEEL/YOKE THROUGH FULL TRAVEL OBSERVING NO DEFECTS.