What was found
PDIS 959 21-30 9546 03MAY23 IND OPEN U AT FL 350 WE RECEIVED A CABIN ALT MASTER WARNING AND EICAS WARNING. CABIN ALT WAS AT 10,000 FT. COMPLIED WITH QRH. CABIN ALT CLIMBED TO 11,000 FT BEFORE WE WERE ABLE TO DESCEND. AROUND FL 180 CABIN ALT LIGHT WENT OUT. ***EMERGENCY DECLARED*** 1 SHGN 03MAY23 22:17 IND U NRR: NO REFERENCE REQUIRED AFTER ACFT BLOCKED IN OPENED BOTH PACK BAYS AND FOUND BOTH PACK DISCHARGE DUCTS ORANGE BOOTS DISLODGED FROM DUCTING. PART 03MAY23 22:23 IND U IDENTIFIED PARTS HOSE MPN: AS1505-28A0032 CPN: 2113640 QTY: 2 PART 03MAY23 22:23 IND U ORDER PART MPN: AS1505-28A0032 CPN: 2113640 QTY: 2 MSN: 2147651 AMM: 21-51-00 REMOVED AND REPLACE R/H PACK BAY AND L/H PACK BAY ORANGE PACK SUPPLY BOOTS REF 757 AMM 21-51-00 AND 21-51-10-4. OPS AND LEAKS CHECKS GOOD REF 21-31-00-5. A/C OK FOR SERVICE. AS AN SDR ITEM, PARTS WERE A TL 0 - BOTH LH AND RH SUPPLY BOOT P/N'S WERE AS1550-28A0032 (HOSE) , CPN 2113640