St60+ no wind speed or directional display

Hi I have a st60+ wind with a masthead transducer and I have no speed data or direction. Dials do move in boat show mode. Voltages at display are
Red to shield 8.02
Blue to shield 7.31
Green 7.31
Yellow 8.04.
There is power to the display, I have three dashes in the speed area. I can not calibrate or place the display in master mode. It is stuck in repeater.
I have done factory reset a number of times.
I thought there was a hard reset that could be done but I forgot the key sequence.
Any help would be appreciated.
Thanks,
Mark