As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CENTER HYD QTY DECREASED TO ZERO AND SYS PRESS AND QUANTITY LIGHTS ILLUM. EICAS MSG "HYD SYS PRESS AND C HYD QTY." DISPLAYED. AFTER INSP, FOUND RAT CHECKOUT MODULE LEAKING DUE TO CHECK VALVE BROKEN. REMOVED AND REPLACED CHECK OUT MODULE IAW 29-21-11. HYDR SYS "C" REFILLED TO FULL, OP TEST SATISFACTORY.