Sorry guys, I know this isn't directly rb related, BUT theres an awful lot of experience / knowledge here I was hoping to leverage

I have an aquazepp LT30 that needs the soldering / wiring tidied up, and a new charger / batteries. Also, its running about speed 3 of a silent submersion scooter. I know the speed on the zepp isn't changeable underwater, BUT, I know that some aquazepps had changeable speed internally, any ideas how to do this / how to check the speed setting? I'd also like to put a switch in so I can switch the fromnt mounted light on/off to conserv batteries if desired, any ideas how? I'm loooking for a manual / any help from people who have these to service / restore this scooter, thanks Graham