What was found
(CAN) APPROX 45 MINUTES AFTER T/O, ECAM MESSAGE SHOWING CABIN PRESS EXCESS CABIN ALT. CREW ELECTED TO DESCEND TO 10,000FT AND RETURN WITH OVERWEIGHT LANDING. CPC 2 HAS JUST BEEN REPLACED. CPC, NR2 INSTALLED, HAS A HISTORY OF THIS FAULT FROM PREVIOUS ACFT. CPC 2 REPLACED AND CHECKED SERVICEABLE IAW AMM 21-31-34, PB 401. CABIN PRESSURE CONTROLLER: PN: 9022-15702-10, SN: 9631750.