If your topside panel is dark or non-existent, then the backlighting bulb maybe burned out, very easy to replace.
This sealant is ideal for sealing topside controls, light lenses, leaks etc.
Dimension One Spas Replacement Button with Magnet.
A 25ft topside panel extension cord for the ML range of touch panels
A 3ft / 10ft and 25ft extension cable for Balboa 8 pin Deluxe and Serial Standard topside control panels - when you need a bit more extra length