The original locks on our 2010 have had it. This last trip, they were almost impossible to turn. We always locks ours while driving so they don't vibrate open and flap down the highway. btdt
It's a good idea to replace the cylinders because many brands of trailer use the same key to lock the storage doors. Yours probably fits many others. What you need to do is measure the depth of the cylinder in the ones you have and make sure to get the same depth. A good RV store will carry replacements or get them elsewhere.