Paul, what Bird described is a common occurence with RJ sockets in telephone handsets, the constant movement either cracks the cct board tracks or if the solder joint is at all fragile it simply cracks that.
Often the cracks are hairline, best remedied by soldering a piece of wire back along the track.
Given what you have described that would be a good starting point. If your soldering skills are a bit average, get someone who is proficient to do it, as too much heat can quickly destroy the fine tracks that usually connect to the RJ PCB sockets.
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