I just bought a used one last week and needed to source the center seat as it came with out it. I found out that they were based out of Seattle but went bankrupt several years ago and shut down. A company out of Florida bought them out but they closed down last year also. Apparently the guy who originally owned it in Seattle manage another inflatable company in Seattle and his sons will do repair work on them.
The former owner of Rendova (Mike?) now owns InflatableBoatWorks 5105 Leary Way Ave NW, Seattle 98107. 206.284.6020 Nice shop with service area. Located near the VW dealership. Seems knowledgeable--says he designed Rendova (I don't know for sure on that). Not sure about the bankruptcy thing, but the Florida company that bought the name did close it.