You can either repair it if you're VERY handy, or have it replaced by a dealer or RV repair shop. Parts are not ridiculously expensive especially if they can be shipped to the dealer in a new trailer they've ordered in order to avoid freight charges.
Contact Sheri Dunlap at the factory. She'll need your VIN # to determine the correct part numbers you need.
Parts Coordinator - Forest River,
Plant 10D Rockwood - Roo / MiniLite / UltraLite
(574) 642-8940direct number
(574) 343-5947direct fax
2011 Rockwood Signature Ultra Lite 8293SS, 12K Equal-i-zer
2016 Ford F-250 XLT SuperCrew, 6.2L, 4x4, 6'9" bed, 3.73
2010 Rockwood Roo 23SS (2012 - 2014)
2009 Ford F-150 XLT SuperCrew, 5.4L, 4x4, 5'6" bed (2012 - 2016)