As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU BLEED WILL NOT OPEN TO START SECOND ENGINE. UNABLE TO DUPLICATE ON ENG INE RUN AFTER RETURN TO GATE. REPLACED K495 RT BLEED AIR ENGINE START RELAY AS PRECAUTION IAW FIM FAULT CODE. ALSO NOTED DEFECT WITH APU BLEED SWITCH ON 2ND ENGINE RUN. REPLACED SWITCH. RAN ENGINE. OPS NORMAL.