What was found
LEFT REV ISLN VALVE EICAS CAME ON, ON LANDING WITH LEFT ENG REV MESSAGE IN YELLOW STAYED ON. STATUS MESSAGE L REV ISLN VAL AND L REV INTERLOCK WAS ALSO DISPLAYED. VISUAL INSPECTION SHOW IB REV SHELL FULLY OPEN, FOUND CENTER DRIVE UNIT AND FOUND BACK HOUSING CRACKED. REMOVED AND REPLACED CENTER DRIVE IAW MM 78-31-21, OPS CHECKS GOOD.