What was found
NR 1 A/C PACK OVERHEAT WITH A BURNING ODOR OF WOOD OR PAPER, NO SMOKE VISABLE. ODOR DISSIPATED WITH PACKS 1 & 2 OFF. ACFT WAS NOT DEICED PRIOR TO DEPARTURE. PERFORMED IDENTIFICATION OF CABIN ODOR IAW TSM 05-50-00-810-831-A, VERIFIED SOURCE OF ODOR AS NR 1 A/C PACK. PERFORMED VISUAL CHECK OF PACK 1 & RAM AIR INLET, NO DEFECTS NOTED. OPS PACK 1, &PACK BEGAN TO OVERHEAT AGAIN. RAN PACK 2 OFF OF APU TO CLEAR ECS SYS OF ANY POSSIBLE RESIDUAL ODORS. NO DEFECTS NOTED. MEL 2152Y FOR PACK 1 INOP.