For a long time the YouTube channel "RV with Tito" has shown great DIY videos for RV repairs and mods. Within the past 2-years he's switched from a Class C to a 2003 Winnebago Adventurer Class A.
Lot's of members with similar Winnebagos have come here with problems with their hydraulic HWH slides and jacks. So, this video has some troubleshooting tips and a how-to on replacing the hydraulic pump motor. Plus, he lists links to the parts.
Hopefully, this will be of help to folks with HWH Hydraulic Slides and Jacks: