Have 1980's Datamarine S200DL depth sounder. Works sometimes and sometimes displays "MSD 18.8". Sent it to Datamarine for repair just before they closed. It did come back, my check was cashed, but it appears no repairs were made. Same problem. Understand the guy who supervised that operation at Datamarine is now doing repairs on behalf of another company. Anyone have experience with this new repair entity?