What was found
VERY SLIGHT ELEC SMELL IN FLIGHT DECK, DOES NOT SEEM TO BE FROM FRESH AIR VENT. LT SIDE WINDSHIELD WIPER MOVED OFF PARK ABOUT 3 TO 4 INCHES TO THE LT DURING FLIGHT NO FURTHER MOVEMENT NO ASSOC CB POPPED. INSPECTED LT WINDSHIELD WIPER SYS, WIPER & WIPER ARM TO CONVERTER SECURITY CHECKS GOOD, NO UNUSUAL PLAY NOTED. OPERATIONS CHECK OF WIPER SYS GOOD IAW AMM 30-42-00, PARK POSITION CHECKED GOOD. INSPECTED CAPTAIN'S & FIRST OFFICER'S WINDSHIELD WIPER & STALL PANELS FOR POSSIBLE ARCING, NO DEFECTS NOTED. ACFT POWERED UP ALONG WITH APU & BLEEDS ON FOR OVER 1 HR, NO UNUSUAL ODORS DETECTED. COULD NOT DUPLICATE PROBLEM.