Just thinking more about this - is your bonnet release electric or cable? If it's electric, then my point above will allow it to be opened once there is enough charge. However, I seem to remember being told that earlier versions of the Box had a normal bonnet release mechanism via a cable. If this is the case, I've no idea why is would be locked, other than the cable or catch corroding and jamming. In this case (and if you can get to the mechanism) a bit of WD40 may do the job.
Cheers
Paul
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