What was found
(CAN) HISSING NOISE FROM THE LH SIDE WINDOW DURING CLIMB. INTERMITTENT CRACKING NOISES HEARD AS WELL. NOISE STOPPED DURING CRUISE/DESCENT. MAINTENANCE INVESTIGATION FOUND THE WINDOW CRACKED ALONG THE BOTTOM.THE CRACK WAS ALONG THE SEAL AND WAS ONLY DETECTED WITH THE AIRCRAFT PRESSURIZED (IT WAS NOT VISIBLE) AND THROUGH THE USE OF WATER/SOAP SOLUTION. THE WINDOW WAS REPLACED AND THE AIRCRAFT WAS SUBSEQUENTLY RELEASED FOR SERVICE. (TC# 20190712004)