this morning i awoke to a very strange refund confirmation email from UA, which was referencing an intact international award booking. i have never made a request for a refund on this booking, last weekend i did make a flight change on two of the return segments after a stopover, switching from US to UA metal.

Refund request number: 1574xxxx

United Airlines ticket number: 0162XXXXXXXXX
Passenger name: XXXXX,XXXXXX
Ticket issue date: 7/14/2013
Original ticket value: 81.70
Refund value: 1
Fee or penalty: 0
Form of payment for refund: No Residual Due

Do I need to be concerned? I verified the booking is still intact on partner airline webpages (NH and NZ).