What was found
CLIMBING THROUGH 17000 HEARD A RUSH OF AIR AND COULD FEEL AIR COMING FROM AROUND CAPT RUDDER PEDALS. STOPPED AT CLIMB FL190, CABIN ALT WAS 5800, SOUNDED LIKE IT RESEALED AND THE RUSH OF AIR/NOISE WAS GONE AND CABIN WARMED UP. CABIN ALT WAS STABLE AT 1400. MAINTENANCE PERFORMED PRESSURIZATION CHECK IAW EMB 170 MM 21-30-00. NO DEFECTS NOTED AT THAT TIME. CREW REPORTED SAME THING TWO FLIGHTS LATER IN ORD. AIRCRAFT WAS FERRIED TO CMH WHERE THE FWD AVIONICS PRESSURE SEAL WAS REPLACED. NO REPORTS SINCE.