I suspect the confusion over 61143 arises from the fact that it was initially sent to Japan as a demonstrator
It was initially sent over 'in bits' and was 'rebuilt' in Japan using a jig from Sikorsky, it ended up as being .5 of a centimeter longer than a 'standard' 61!. If you'd ever talked to an Irish SAR driver it was generally not liked as it used about 3 to 4 % more torque for any flight profile than any of the others, (and has still got the Mk 1 speed selects, I still have the indents on my thumbs to prove that!).
I guess that EI-GCE was across in Norway for the mods as SAR will be the 'spare' 501 machine, and would not normally be based in Shannon.