What was found
CABIN ALTITUDE WARNING MESSAGE AT 24000FT / REMOVED AND REPLACED BOTH CABIN PRESSURE CONTROLLERS IAW CRJ 900 AMM 21-31-04-000/400-801. REMOVED AND REPLACED CABIN PRESSURE CONTROL PANEL IAW CRJ 900 AMM 21-33-01-000/401-801. OPS TEST GOOD. PERFORMED OPS TEST OF OUTFLOW VALVE IAW CRJ 900 AMM 21-32-01-720-801, VALVE OPENED AND CLOSED .OPS CHECK GOOD. PERFORMED OPS TEST OF SAFETY VALVE IAW CRJ 900 AMM 21-32-03-720-801 , VALVE OPENED AND CLOSED OPS CHECK GOOD REMOVED AND REPLACED JB10 PCB 1 IAW CRJ 900 AMM 24ˆ’05ˆ’03ˆ’000/400ˆ’801. PERFORMED OPS CHECKS IAW CRJ 900 AMM 24ˆ’05ˆ’03ˆ’710ˆ’801-A04 EXCEPT FOR 4A5 AND 4A15. REMOVED AND INSTALLED JB11 PCB 2 IAW CRJ 900 AMM 24ˆ’06ˆ’05ˆ’000/400ˆ’801. PERFORMED OPS CHECKS OF JB10 PCB 1 AND JB11 PCB2 IAW AMM 24-06-05-710-801 AND AMM 24-05-03-710-801. OPS CHECK GOOD.