Kwikee step control

Motorhome is a 1993 Flair.Step always will go out but sometimes i have work with it to get to retract.I hooked a test light to the wire that becomes hot when it retracts.You can hear the contacts working in the control even if the wire doesn't become hot to retract the steps.I use a magnet off an old speaker to operate the door switch.This allows me to lie under the coach and operate the steps to see exactly what is happening.The steps are 26 series single step.Amazon has the 909510000 control for $85.67 and free shipping.I can get a complete conversion for around $225 but everything else is working fine and who knows how long it will last.To me it's wasting money to replace parts that are working.One post said you can replace contacts in control.This is a sealed unit but please tell me more.If I can open it and replace parts inside I will certainly do so.Thanks for input from everyone.Curley