What was found
AIRCRAFT WAS GROUNDED: AIRCRAFT RETURNED TO ORD DUE TO LOUD WARNING HORN CONSTANTLY SOUNDING. STARTED PASSING FL28500 AND STOPPED ON DESCENT AT 12500. MAINTENANCE FOUND 5 BOLTS NOT PROPERLY TORQUED ON THE LEFT HAND ACCESS PANEL IN THE NOSE WHEEL WELL AND PROPERLY TORQUED THEM PER AMM 53-14-01. A SATISFACTORY PRESSURIZATION LEAK CHECK WAS ACCOMPLISHED. (AALA202007149011) MAINTENANCE ALSO REPLACED THE AURAL WARNING SYSTEM MODULE AS A PRECAUTIONARY MEASURE PER AMM 31-51-04. (AALA202007159024) A SATSIFACTORY FUNCIONAL CHECK FLIGHT WAS ACCOMPLISHED WITH NO ISSUED NOTED.