What was found
IMMEDIATELY AFTER TURNING THE NR 1 ON, DURING THE START OF DESCENT A BURNING SMELL WAS NOTICEABLE IN THE COCKPIT. REPEAT WRITE UP, REF 522004. RAN NR 1 PACK, FOUND NO TRACE OF BURNING ODOR. OPENED NR 1 ENG, CHECKED DUCTING, FOUND OK. RAN ENGINE, STILL NO BURNING ODOR, INSPECTED DUCTING AT NR 1 PACK CHECKED OK. FOUND SECOND OFFICER'S LEFT MAP LIGHT TERMINAL BURNED. REPLACED TERMINAL, LIGHT CHECKED OK. C/N DUP ODOR PROBLEM.