About a month ago I started having trouble with my door side slide out on my 2018 3901WB. It started with the pump breaker tripping and resetting while bringing in the slides. I replaced the breaker and checked out the rest of the system and found that the hydraulic slide cylinder was leaking oil. I took it to the local dealership and they replaced both slide cylinders under warranty. I got it back and I still have some seepage out of the door side cylinder but just a few drops after extending the slides. I just wondered if anyone else has had this issue. It seems to me that the slide orientation is somehow causing this issue by stressing the slide out cylinder and ruining the seal. Maybe I just got three bad cylinders. I will bet that my issue is not solved. Any ideas will be appreciated.

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Thanks for the suggestions. The unit has been in my driveway since I bought it in June so cleaning and lubing was not the issue as it is immaculate. My dealer did adjust the slide but I have found that the bracket that the slide cylinder mounts to under the rig was welded in place a little crooked causing the cylinder to bend slightly when under stress. I'm either going to cut it off and re-weld it or put a hillside washer around the bolt to cause the cylinder to point straight. I'm on my way to Florida now so I will have to work on it there.