Sounds like the cement slurry backed up inside the Production casing due to the Plug issue.
Norm is to squeeze the cement out of the casing into the annulus & let it set before they release the rig, which is why they've mentioned 'milling the cement sitting inside the casing & then re-cement it for testing'. This will slightly delay the rig release, until the casing is cemented for the upcoming flowtest.
Ann: Lockyer Deep-1 Operational Update, page-26
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