I have a number of MFJ items that I picked up in non-working
conditions and fixed up. They include MFJ-259B, MFJ-931, MFJ-949E
and others. Other than the 259B which involved cleaning leaky battery
residue and replacing the input diodes. most of the work involved
resoldering and/or replacing blown meters, and in once case
a bandswitch. Once repaired, everything
has remained totally reliable and functional. I've never had
problems ordering parts from them to fix the stuff.
The 'Mighty Fine Junk' reputation is deserved only because of
the poor soldering, but once repaired it serves one well -- at
least in my books!

Irv VE6BP