What was found
PDIS 637 05-50 2016111 27MAR19 BTV CLOSE ELECTRICAL BURNING FUME DETECTED IN CRUISE FLT. SMELL OCCURRED TWICE THEN DISSIPATED AND DID NOT RETURN. HISTORY: YES FACT 27MAR19 13:23 BTV OPERATED BOTH BLEED SYSTEMS AND PACKS INDEPENDENTLY NO ODORS DETECTED. OPS CHECK W/S HEAT AND ALL ELEMENTS ON W/S, NO ODORES DETECTED. OPS CHECK ALL AVIONIC AND ALL FLASLIGHTS WITH NO BURN ODOR DETECTED. INSP. W/S HEAT FUSE, NO DEFECTS FOUND. OK FOR SERVICE AT THIS TIME.