As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON TAKEOFF, PILOT UNABLE TO CONTROL CABIN PRESSURIZATION, RETURN TO AIRPORT OF DEPARTURE. FOUND SPLIT PRESSURIZATION LINE AT OUTFLOW VALVE, REPAIRED IAW BEECH 200 MM20-06-00 PG 201. AIRCRAFT TEST FLOWN. PRESSURIZATION SYSTEM FUNCTION NORMAL.