I agree that he shouldn't be afraid to file a grievance if he has to. I am just cautioning against doing so while he is on his probationary period. After he makes seniority they can't send him back to PT. Would they do that just because he filed a grievance? Hard to say, there are a lot of variables that can swing it either way and neither of us knows how they affect his particular situation. I am just erring on the side of caution.