Service ratings are governed by Article 10 of the A&R contract. All P5 bargaining unit employees should receive their service rating 3 months prior to their "anniversy date of July 1 or January 1". This typically means: ratings should be reviewed by the employee by September 30th or it is deemed to be "late".
If any category within your service rating is rated fair or unsatisfactory you should immediately contact a union steward to discuss the service rating and your available options. All ratings with 2 Fairs or 1 unsat should be grieved. There is a window period of 30 days to file the