What was found
EMERG EXIT DOOR SEAL: DURING FLIGHT AT 23,000FT PAX NOTIFIED US THAT THERE WAS A LOUD NOISE COMING FROM THE LAV. I WENT BACK TO LAV AND THERE WAS A LOUD HIGH PITCH NOISE COMING FROM THE UPPER RIGHT PORTION OF THE EMERGENCY EXIT DOOR WHEN FACING THE IT. WHEN IN THE FRONT PORTION OF THE CABIN AREA YOU COULD NOT HEAR IT BUT IN LAST 2 SEATS THE NOISE WAS VERY PROMINENT. // SIGNOFF// REMOVED AND REPLACED EMERGENCY EXIT DOOR SEAL IAW CE-680 MM 52-20-00. OFF P/N: 9914713-1 S/N:N/A ON P/N: 9914713-1 S/N:43486 REINSTALELD ORGINAL EMERGENCY DOOR IAW CE-680 MM 52-20-00 AND ACCOMPLISHED EMERGENCY DOOR PRESSURIZATION AND LEACK CHECK PASS. NO LEAK DETECTED AT THIS TIME. WORK DONE IAW CE-680 MM 21-30-00.