What was found
ATB, IN CLIMB CABIN PRESS UNCONTROLLABLE. CABIN EXCEEDED 10,000 AT 13,000 MSL. RETURNED TO KSDF. R & R CPC-1 REF. AMM 21-31-04 FUNCTIONAL TEST & RTS TEST PASSED, NO FAULTS NOTED. R & R ACC-2 REF. AMM 21-62-01 RTS TEST PASSED. DURING OPS TEST, SENSOR READOUT OF ACC-2, PK2 FLOW READS 15 LBS/MIN. READING SHOULD BE UNDER 5 LBS/MIN. FOUND DUCT ACM7009-507 WATER SEPARATOR OUTLET DUCT COUPLING ROD END BROKEN. R & R COUPLING ROD ENDS IAW IPC 21-54-01-01-560 & -564 & DWG ACM7009. PERFORMED OPS TEST OF ALL THREE PACKS IAW MM 21-53-00-840-801, ALL PACKS OPS NORMAL, PACK FLOWS SIMILAR FOR ALL THREE PACKS.