What was found
DURING CLIMB THE AIRCRAFT FAILED TO PRESSURIZE. CREW COMPLIED WITH QRH AND RETURNED TO BNA. CA DV WINDO NOT SEALING PROPERLY AT TOP -C/A-INSP CA DV WINDOW AND FOUND TOP AFT SECTION OF THE FRAME SEALDISBONDED SEE ITEM 3 FOR FURTHER ACTION C/W GROUND PRESSURIZATION CK IAW EMB AMM 21-31-00 NO LEAKS NOTED. RESEALED CA DV WINDOW SEAL IAW EMB AMM 56-11-03. REACTIVATED PRESSURISATION SYSTEM IAW EMB AMM 21-31-04. PERFORMED PRESSURIZATION CHECK IAW EMB AMM 21-31-00. PRESSURIZATION CHECK GOOD.