As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 3671 - DURING CLIMB-OUT OF MSP, CABIN HIGH ALTITUDE LIGHT ILLUMINATED. RAN QUICK REFERENCE HANDBOOK AND GOT CONTROL OF PRESSURIZATION MANUALLY. AIRCRAFT RETURNED TO MSP. MAINTENANCE REPLACED PRESSURIZATION CONTROLLER (P/N 278A000). PERFORMED CHECKS IAW 21-30-00. ALL CHECKS GOOD. (M)