The same happened to me on my Lemon (but after about 3 years) - so check how long the previous owner had it.
It required a new bottom bracket. My gut tells me just to tighten will only fix it for a journey and no more.
As you point out, the bottom bracket is not a track-specific bb the local bike shop had to find the right one. LMNH will have no problem with it but I'm sure you might know other shops that might be able to assist you
The same happened to me on my Lemon (but after about 3 years) - so check how long the previous owner had it.
It required a new bottom bracket. My gut tells me just to tighten will only fix it for a journey and no more.
As you point out, the bottom bracket is not a track-specific bb the local bike shop had to find the right one. LMNH will have no problem with it but I'm sure you might know other shops that might be able to assist you