As long as the pass is a full price pass and not one that is part of a hotel/ticket package they will refund the full cost (only if you go on day 1 and exchange for an AP) - after that its on a sliding scale as its value reduces day by day.
WE had a 3 day pass (part of a package) at Easter and asked about exchanging for AP and were told we wouldnt get anything off- so we decided to wait until next trip (which was In july) to get APs then
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