here is the murex parts list you're one is about halfway down the part number is 1414818
I presume you can order it from murex but not sure
you could take out the diode and see if you can find a similar one
Thank you for the reply, I am in Barbados, West Indies/Caribbean and I need to get the diode urgently. Do you have a telephone number for the company, I need it urgently, I cannot work without it ?