As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER PUSH BACK AND ENGINE START LT ENG BLEED EICAS, NO DUCT PRESSURE ON LEFT SIDE. TRANSFERRED TO MDDR 129269 PER MEL 36-11-01-02A, CAT 'C', DUE 14JUN20. C/W MX ACTION, PRSOV SECURED CLOSED AND FAMV OPEN. PLACARD INSTALLED. REMOVED AND REPLACED NR 1 ENG PRSOV CONNECTOR D22 IAW SWPM 20-30-10. THIS CLEARS DMI 129269.