[time-nuts] Z3801A GPS Rx board substitute?

[Dan Rae]

My faithful 3801, some 207 thousand hours old, has developed an 
occasional fault that I think must be down to the Motorola Oncore 6 
channel board and I wonder if there is an available unit that could 
replace this, or what the recommended substitute is?  eBay searches 
don't show any of the original ones.   I'd like to keep it going, it was 
the first GPSDO I got, and despite getting and building many others 
since, I'm stupidly fond of it.

Thanks,

Dan