Deaconblue
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Yeah, looking harder at the fill spout would be a good thing to check first before going through the wall - good suggestion.
It's a two handle control (technically three, as we have a twist handle for diverting to shower). Lots of potential problem spots.
All three of those are potential leakers. Take them apart and check for leaks before you tear out walls.
It may be as simple as tightening a gland nut or replacing packing.