What was found
(CAN) AT FL 330 AFTER SELECTION OF AIRFOIL ANTI-ICE TAIL ANTI-ICE WITH ENG ANTI-ICE ON, CABIN ALT CLIMBED TO 10,000 FEET. AIRFOIL ANT-ICE SELECTED OFF AND DESCENT INITIATED. AT 29,000 FEET,CABIN STARTED A 500 FOOT CLIMB RATE. FOUND DUCT CONNECTOR ADRIFT AT LT AIRCYCLE MACHINE DISCHARGE AFT SIDE OF HEAT EXCHANGER. CLAMP INSTALLED SYSTEM SERVICED.