As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAXI OUT WHILE STARTING RH ENGINE R START VALVE ANNUN ILL WITH ENG START(RH) IN GND THE VALVE LIGHT WILL EXT W/ SWITCH IN AUTO. A/C RETURNED TO GATE (BTB) AND MTX GROUNDED A/C . AND DEFERRED RH START VALVE FOR DEPARTURE AND IAW MEL ABX -80-10-2-1 FOR DEPARTURE AND RETURNED A/C TO SERVICE