Assuming you have HWH levelers, I suggest that you give them a call. Their customer service is excellent. They also have parts for every system they ever made.
Is your step vacuum or electric? If vacuum, parts will be hit and miss, I fooled with my vacuum step for a couple of years then replaced it with a double electric step from Quickee. I no longer have any problems.
If you want others to be happy, practice compassion.
If you want to be happy, practice compassion - The Dalai Lama
1984 310 Limited Motorhome
Courtesy Parking (W/S/E/Wi-Fi) on I-5 in Northern California, 70 miles from Oregon border