As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CABIN PRESSURIZATION CONTROLLER CONTINUOUSLY BLINKS WHEN LIGHTS SWITCH IS IN DIM MODE. DIGITAL READOUT DOES NOT DIM EITHER. GROUNDED - YES. KNOWN ANOMALLY. PULLED & RESET 5 EA PRESS C/B'S. OPS CHECK PRESS SYS & IT'S PNL LIGHTING GOOD. REF B737--800 FIM 21-31 TASK 803.