What was found
INSPECTION TYPE: N/A AT FL 330, WE OPERATED ENG ANTI-ICE AND SCOOPS. AN ODOR OF BURNING RUBBER BEGAN, AFTER SECURING ANTI-ICE/ SCOOPS ODOR DISIPITATED. R MANIFOL D WAS 270 AND L MANIFOLD WAS 260 DEG/C, R PACK TEMP 160 AND L PACK 80 DEG/C. RAN ENG 1,2,3,4 BLEED AIR TEMP NORMAL IAW MM 36-20-00. RAN BOTH PACKS OPS CK GOOD IAW MM 21-55-00. NO ODOR NOTED DURING ENG AND PACK OPERATION. IAW MM 36-00-00 TROUBLESHOOTING, IF ANTI-ICING INADVERTENTLY OPERATED ABOVE 30,000 FEET AIR TEMP BLEED MAY EXCESS 250 DEG/C.