Okay, so my building was having a Sunday sort today. I signed the intent sheet, which said part time employees on the preload, day, twilight and night sorts.... So I recently switched to preload from twilight for educational and family reasons. I submitted my intent in January and had to wait until June to switch. The twilight manager kept me until I got the union involved and finally let me go to preload. During this time, two employees switched to preload with lower seniority. The twilight manager was pretty mad at me at the time when I switched. Anyway, back to today. Showed up at 11:45 for the 12:00 start time. FT sup told me where to report and thanked me for coming in. Then the manager saw me and told me to go home, no preloaders are allowed. I was like, uh what? Instead of going home I went straight to the union hall, 5 minutes away, and talked to the BA and got some grievance forms. I am going back tomorrow to turn them in. Anyway, my question is can they deny me working extra just because I'm on preload? The BA said it was a bunch of bull and they try to pull this a lot. Also, employees with less seniority was working. Should this be a pretty easy case to win?