As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ACFT DID NOT PRESSURIZE ON DEPARTURE. GROUND RAN AIRCRAFT CK LEFT AND RIGHT ENGINE SEPARATELY FOR PRESSURIZATION. OPS CK GOOD. CHECK PRE PRESS. OP'S CK GOOD. INSPECTED AND OP'S CK WOW SWITCH OP'S CK GOOD. NO DEFECTS NOTED ON GROUND IAW CESSNA 560 MM CH 21-31-00.