This morning, Edinburgh passed an ops CE-sft-lcg-rm-rep test for the first time in weeks! The reason for the success: a different destination SE was being used in the 3rd party replication. Instead of lxn1183.cern.ch, the test used castorsrm.cern.ch. Unsurprisingly, we immediately started failing the test again once the default SE switched back to lxn1183. This one really is proving difficult to debug.