Background -- Ms SWMBO Stanbury was on AC 825 AMS-YYZ on Sept 3 -- delayed by 5 hours due to an "electrical fault". She intends to make an EC261 claim. The FA's distributed white forms which, when completed and submitted on-line, will apparently result in one of the famous codes for a reduction on a future flight. Question -- am I right in supposing that it is better NOT to submit that form, at least at this stage, since AC may then take the position that accepting that offer would negate or replace the EC261 claim?