Large Keyboard (Ashton-U-Lyne OL6)

Yamaha keyboard with 12V DC supply. Two faults- three of the keys have cracks in them (see photo) and the lowest pitch note doesn't work from when I opened it up to try and glue the broken keys. The lowest key could probably be made to work but the cracks seem to be non-glueing. It was fun for our kids with different instrument sounds, plays tunes and got them interested in music. It is quite heavy and about 3 feet side-to-side.