I used the weather waiver. I was going ABE-EWR-SEA and back on 2/3. I switched the trip to 2/10. I booked them each OW. I changed my ABE-EWR-SEA on CO.com, Y fare. When I went to change the trip home SEA-EWR showed Z fare for $0. When I clicked continue an error showed up. When I called CO the agent got me on the flight but had a supervisor put me back on my L fare.