What was found
LEVELING AT FL410 CABIN RATE INDICATOR FLAGGED RED & IND A CABIN CLIMB RATE ABOVE 1000FPM. INITIATED A RAPID DESCENT AS CABIN CLIMBING, & RAN CABIN ALT - EMER DESCENT QRC, MASKS DEPLOYED. ON ARRIVAL TO AIRPLANE WE DID NOT SEE ANY LATCH CAS. INSPECTED LH PRECOOLER AND INTERNAL BAFFLES FOR DAMAGE & SENSING LINE BETWEEN FAV & PRSOV IAW AMM 36-11-05. PERFORMED VISUAL INSPECT OF HEAT EXCHANGE PACK IAW AMM 21-52-02-210-801-A. PERFORMED PRESS OF ACFT WITH ENGS IAW AMM 21-31-00. OPS CHECK OF OFV PRESS CONTROL MODES MANUAL, AUTOMATIC, & EMERG IAW AMM 21-31-00. NO DEFECTS DURING INSPECTS &/OR OP CHECKS. INSPECTED RAM AIR CHECK VALVE IAW AMM 21-23-04. NO DEFECTS. R & R LT FLOW CONTROL SHUTOFF VALVE IAW AMM 21-21-01. OPS CHECKED GOOD IAW AMM 36-00-00. ORIG SUBMISSION DATE: 01/11/2024