Well now, LORAN is decommissioned in the USA, but not in other areas...
...but I don't know the answer to the original question. If I were in an area where LORAN is still operational, and had a LORAN which required repair, I'd just make a deal to buy any of the tens of thousands of still-good LORAN units in the USA.
I have a wonderful Northstar M1 which works perfectly, but for the absence of a signal to receive.
Bastards.