My bike's two years old (about 1800km on it, almost all road and bridleway) and kept in a garage. Back in November or so I locked the front suspension fork for road-riding, and over the winter probably did about 50 miles in short ~7 mile jaunts. A couple of weeks ago I tried to unlock my forks, and while the lockout lever moves ok, the forks appear to remain locked; they absolutely refuse to budge even a mm.
I've not had my forks serviced to date. The dealer is saying its because I had the forks locked for several months and neglected to have them serviced. It has always worked quite well.
I think the fork is a "Merida M-510, 100 mm, LO" (This looks like it) - although google finds nothing on that, so I guess its a rebranded something.
So my question - what's likely happened to the forks? Is it something I can fix (and how?)? Is it likely to be a manufacturing defect? And of course, does locking for a long time (even if unused for most of that time) cause issues?
Note: I've read the questions on here about fork maintenance; none of them mention locking for prolonged periods.