Please find 'Attached' a Duplicate Board that I would like a Ruling on; played at my local club last evening. The Bridge session was a normal night, i.e not a special event. The four involved players were all experienced, with N/S a more regular partnership than E/W.
The Bidding is as attached. I was called to the table (as Director, the Board having been Bid & Played) with N/S raising the point concerning Misinformation by East on the 2H Bid by West. The explanation given was that the 2H Bid was 'Strong'. South as a result, said that he felt damaged by East's explanation. On inspection of East's 'System Card' he had entered 'Michael's Cue Bid'. North or South did not ask to see East or West's 'System Card' during the auction or playing period. The Traveller for this Board had three entries of 660 N/S, one for 650, one for 600 and three going off in 6NT (including this Deal), -100. Has the offending side, in this case E/W gained a legitimate advantage from the irregularity and should N/S obtain an adjusted score.
Any views?

Help

..W... ..N..... ...E... ..S
........ ........ ........ ..1♥
2♥#1 ..2♠... ...3♦. 4♣#2
..P.... 5♣#3 ....P.. ..6NT
..AP
#1 Not alerted
#2 Modified Roman Gerber
#3 Two Aces & Two Kings
Result: 6NT -1