wow, i found this old thread because i have the same kids toy on my bench right now.
mine has failed because water got into it and corroded the two buttons.
another design failure. having this thing right next to the sink, where kids play with water.
they did take this into account somehow, because all the electronics is elevated and there are drain holes for water, but they still did not waterproof the buttions.
the only place where there is electronics right underneath.
long story short, i opend it up and my first thought was straight away, that this thing is unneccessary co