Could you look at this graph and estimate if 210 dip indicate bridge tap?
I have looked and it is exactly as what I have previously seen in some of your Hlog plots.
It is not due to a bridging tap. Its shape is quite wrong; it is too wide and shallow.
I attach, below, two Hlog plots with data obtained from one circuit. (Unfortunately the CPE - DSLAM paring did not record the US data. (Upstream relative to the CPE.)) The first plot shows the presence of a bridging tap. The second plot is from the same circuit once the bridging tap had been removed.
The third image, attached for reference, shows the classic shape which is characteristic of a bridging tap.