As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF, MAIN ALT HAD YELLOW DASHES ON EICAS. DEFERRED IAW MEL 21-18. PERFORMED OPERATIONS CHECK OF PRESSURIZATION CONTROL SYS IN BOTH MANUAL & AUTO MODES IAW AMM 21-31-00. OPERATIONS CHECKED GOOD, NO DEFECTS NOTED. MEL RESTORED.