As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CLIMBING THROUGH 11,000 FT CABIN WARNING. WOULD NOT WORK IN AUTO OR MAN MODE. RETURN TO AIRPORT. PERFORMED INSTALL NEW GROUND CONNECTION VALVE IAW AMM 21-22-04 OPS AND PRESSURIZATION CHECK GOOD. INSTALL BOTH ESCAPE HATCHES IAW AMM 52-21-00 OPS AND PRESSURE CHECK GOOD.