Air China 787 B-1466 delivery

Air China 787-9 B-1466 msn 34314 ln 589 flew away on delivery Aug 12-13 CHS-PEK flying as CCA048, however diverted back to CHS after circling for 30 mins (dumping fuel?) and arrived back in CHS 1 hour later.  Second attempt 1.5 hours later went without a hitch, flying again on the same callsign.