As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
R ENG ON START REACHED 25 PERCENT N2 FUEL ON EGT WENT TO 309 THEN TEMP AND N2 FAILED TO RISE FURTHER. ON 2ND ATTEMPT ENG START VALVE LIGHT ILLUM. RTB MANUALLY STARTED ENG. FWD MCO PER MEL 80-00-02. REPLACED START VLV, PERFORMED ENG START, OPS CHECK OK. MCO AND PL REMOVED.