problem with analog outputs on BL5S220

I have a project almost finished, working with the BL5S220 single board controller. Everything works fine except the DAC outputs are stuck at 10 volts. I have tried the sample programs, the outputs start at zero, but when set to any value, they stick at +10 volts and stay there, Sometimes setting 1 volt or zero will cause them to go to 9 volts.

This is the last problem I have to fix before I can ship this thing, and it looks like the hardware is just broken…

Any ideas that might make these ports work?