What was found
FLIGHT 6370 - RDU-MCO - INTERMITTENT ODOR IN COCKPIT DURING FLIGHT. SMELL RESEMBLES BURNING SULFUR, AND ALMOST HAS AN ELECTRICAL BURNING SMELL. VERY STRONG FOR APPROXIMATELY 30-60 SECONDS, THEN GOES AWAY. NO ACTUAL SMOKE WAS PRESENT. BOTH TIMES, STARTED WHEN ENTERING PRECIPITATION. INSPECTED UNDER FLOOR BOARD OF AFT CABIN FORWARD OF LAVATORY. INSPECTED UNDER FLOOR BOARD OF CARGO COMPARTMENT. ALL ACCESS DOORS OPENED AND INSPECTED. NO DISCREPANCY NOTICED. COULD NOT DUPLICATE SMELL. ALL WORK DONE IAW EMB 145 MM 36-00-00 AND 70-00-00 ENGINE RUNS.