BAD Rowe problem

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The worse thing that could happen. Both changers broken. One said "CK STACKER" I have gotten this message before when the stacker was bent. I inspected the stacker and everything seemed okay. So I reset and everything was okay. Second said "BUCKET POWER ON" I have gotten this message before also. I really do not know what this means but I checked the power and it was on so I reset and everything was okay.