As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAXI , R ENG STARTER CAUTION MSG ON ENG START , AC RETURNED TO GATE(BTB) AND MTX GROUNDED AC . TROUBLE SHOT AND REPLACED R/H ISOL CHECK VALVE IAW AMM 36-11-05 DUE TO BROKEN SPRING OPS CHECKS GOOD A/C REMAINS NO ETOPS MTX REPERUNED AC TO SERVICE.