As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 103 - COS TO ONT - FLIGHT CREW REPORTED A/C WOULD NOT PRESSURIZE DURING WINDSHEAR ISSUES ON CLIMBOUT. BLEED WERE OFF, THEN TURNED ON. A/C RETURNED TO BLOCK WITHOUT INCIDENT. CONTRACT MX (ARNIC) RAN THE ENGINES WITH FLIGHT CREW AND OPERATIONALLY CHECKED GOOD AND PRESSURIZATION PASSED SATISFACTORY. A/C WAS RELEASED TO RETURN FOR SERVICE.