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The first step occurred between 08:00am and 09:00am Jan 14th, the second step between 07:00am and 08:00am Jan 16th (both times are GMT). I can find no evidence of a failure on January 14th, however it sure looks like there was one. On further inspection, it appears that this step only appears for the TENET target site (see below for the minimum RTTs in msec measured each hour (0 1 ...) from SLAC to the target (Remote-Site) on Jan 14th, 2020), and thus is not related to the cable problems. This can be seen more clearly in the plot below. The spreadsheets are available here.
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One can also look at the various statistics for both Average RTT and losses
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Traceroute
The route measured 19:00 hrs 1/28/2020 PST from SLAC to South Africa goes East across the US via Chicago, Washinton Washington to London and thence S. Africa:
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