What was found
LOST CABIN PRESSURE MOMENTARILY. DUE TO NO CONCLUSIVE FIX FOR LOSS OF PRESSURIZATION, ACFT HAD A DIAGNOSTIC FLT FLOWN BY THE EG TEST CREW TO CHECK THE OPERATION OF THE PACK-BLEED-PRESSURIZATION CONTROL SYS. ACP'D ON FLT 9829-25. PERFORMED MCDP TEST LAST FLIGHT FAULT, FOUND MESSAGE L-V NAV FAIL ADC SYS R. LT PACK, HOT AIR TUBE ATTACHED TO HEAT EXCHANGER CONDENSER ASSY HAS WORN HOSE ATTACHMENT SECTIONS. REPLACED WORN HOSE ATTACH SECTIONS. LEAK CHECK GOOD. ALSO REPLACED ADC.