What was found
BURNING RUBBER ODOR AT INITIAL POWER UP ON TAXI OUT. THEN ON TAKE OFF ROLL. ODOR GOES AWAY IN ABOUT 10 SECONDS. TURNED ON ALL EXTERIOR LIGHTS. DETECTED A BURNING ODOR. TURNED OFF LIGHTS WOULD DIMINISH THE ODOR. PULLED DOWN LIGHT OVERRIDE PANEL, AND NOTICE LIGHT SWITCH ARCING. R & R LIGHT OVERIDE CONTROL PANEL ASSY IAW AMM 20-60-00, GROUND OPS CHECKED ALL LIGHTS ON CONTROL PANEL. ALL CHECKED GOOD, NO FUTHER ODOR NOTICED, ACFT OK FOR CONTINUED SERVICE AT THIS TIME.