What was found
DIVERSION AT 37,000 FT, ALTIMETER HORN SOUNDED. NO AUTO-FAIL/STBY LIGHTS INDICATED. WENT TO MANUAL & DIVERTED TO BWI. REMOVED AND REPLACE AFT CARGO DOOR SEAL, APU AFT PNEUMATIC DUCT BOOT & LT A/C PACK FLEX BOOT FWD OF WATER SEPARATOR PER MM.