What was found
ON DESCENT GOT A VERY STRONG SMELL AS IF SOMETHING ELECTRICAL GOT VERY HOT. COULDN''T IDENTIFY WHERE IT WAS COMING FROM, WENT AWAY ON APPROACH. PERFORMED ALL 4 ENG RUN CHECKING ASSOC ELECT SYS''S RAN PACKS AND RECIRC FAN, RAN SUPPLEMENTAL COCKPIT A/C AND HEATER. TURNED ON WINDSHIELD HEAT AND ANTI-FOG. CK''D ALL COCKPIT LIGHTING. ALL W/NO DEFECTS OR ELECTRICAL SMELL NOTED. UNABLE TO DUPLICATE DISCREPANCY ON GND MX CK OF ACFT.