Level of moisture was fairly low, more like condensation but I've got it disassembled following your suggestion. Looking at the case it appears the seal groove has a slightly sharp edge around the vertical groove the screen cover slots into. I'll try and dress it to remove so I don't have the same issue again.
I just moved house in the last couple of weeks so it's possible that when carrying boxes it got squeezed a bit more than typical use. When I opened up the back the seal had a fairly clean cut and filled about 75% of the groove which explains the moisture.
I had some moisture behind the screen on my bangle and when I opened it up the seal had cut. I've taken a look in the shop but doesn't look like the seal is for sale. Does anyone know the dimensions/specifications for it so I can see if I can source it elsewhere?
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Level of moisture was fairly low, more like condensation but I've got it disassembled following your suggestion. Looking at the case it appears the seal groove has a slightly sharp edge around the vertical groove the screen cover slots into. I'll try and dress it to remove so I don't have the same issue again.