Ours came off the wall. The back panel is held to the cabinet with very small nails what I did was unscrew the back panel from the wall, run some screws in to the panel to the cabinet to hold the back on and then put the cabinet back in place using the same 4 screws they had used to hold the cabinet. Poor design to use just some little nails to hold the cabinet back panel to the cabinet frame.
2011: 54 days, 2012: 218 days, 2013: 175 days, 2014: 196 days
2015: 188 days, 2016: 72 days, 2017: 185 days: 2018 182 days
2019: 156 days (2009 Berkshire, 390QS, and toad)