I had two hoses on the living room slide "fail". The only symptom they showed was a pin hole in the middle of the hose. The failure was around the connectors, allowing the fluid leak under the outer plastic coating. They did not leak a lot of fluid but you could see the pin hole. Luckily the holes were in a place that I could see, if the hole had been somewhere hidden it could have gone unnoticed for some time.
Dave, Bobbi and Fenway
2005 38' FDTS Alpine Limited, 2016 Jeep Grand Cherokee Limited
Cape Cod, MA