What was found
EN ROUTE FROM PHX TO DTW, CREW REPORTED HYD GREEN RESERVOIR LOW LEVEL. FLIGHT RETURNED TO FIELD AT PHX & LANDED WITHOUT INCIDENT. R & R A CHAFED GREEN SYS HYD LINE TO THRUST REVERSER ISOLATION VLV FILTER IAW AMM 78-37-51. OPERATIONS & LEAK CHECKED NORMAL. COMPLIED WITH TASK 29-00-00-280-006-A01, CHECK OF GREEN HYD SYS & TASK 32-00-00-860-003-A, OPERATIONS NORMAL.