What was found
SOUNDED LIKE ELECTRICAL ARCING & STATIC SIZZLING. SPOKE WITH FLT CREW. FLIGHT CREW CONFIRMED THE INITIAL POPPING SOUND FOLLOWED SIZZLING SOUND THROUGHOUT THE ENTIRE FLIGHT AS RECORDED BY CAPTAIN. UPON INSPECTION OF CAPTAINS SIDE, FIXED WINDOW, ON EXTERIOR, FOUND WEATHER SEAL DAMAGED AND EVIDENCE OF SEAL FLAPPING ONTO THE FUSELAGE AND AREAS OF MISSING SEALANT. CHKD POST FLT REPORT & WINDOW HEAT CONTROLLER. NO FAULTS FOUND. TESTED WHC1, TESTED OK. IAW AMM 30-42-00/001. CHECKED C/BS, ALL WINDOW HEAT BREAKERS CLOSED. ACCOMPLISHED ECRA 5611-01399, PART 1 - INTERIM REPAIR STEPS 1 THROUGH STEP 3.