What was found
DURING TAKEOFF ROLL, BURNING RUBBER ODOR IN COCKPIT. ONCE AIRBOURN ODOR DIMINISHED. BOTH PACKS ON. NO SMOKE AT CRUISE OR CLIMB OUT. HOWEVER DURING DESENT INTO GSP ODOR RETURNED. ON TAXI IN, ODOR SUBSIDED, ALL ENGINE INDICATIONS NORMAL. NO EICAS MSG FOUND. LEFT RUNWAY LIGHT SWITCH ON, SHORTED AND SMOKING IN THE ON POSITION. R & R SWITCH AND R & R LEFT T/O AND NOSE GEAR TAXI SWITCHES, PRECAUTIONARY IAW MM 33-11-00-201, 33-42-00-401. ACFT OK FOR SERVICE.