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Thanks for posting
If the belt is tuck and can not be released then most likely the belt retractor assembly needs to be replaced. There is one panel that goes from the back to the front where the door opening is, The panel is mostly help on with plastic clips that pop off, there are a couple of screws that have to be removed, you have to remove the vent cover and a couple of plastic covers for more screws underneath, remove the seatbelt anchor at the floor where it exits through the panel.