The hot ones are likely good as they are in series with the load, that is 
why those supplies are called series regulaters.  I'd replace all four 
from the same vendor so you have sort of a matched set.  Should be able to 
get those from mouser or some one.  You will also need some silicon 
grease.  When you pull the transisters, watch for the thin mica insolater 
that is between the chassie and transister.  Some times these stay stuck 
to the chassie, or heat sink, and some times they come with the 
transister.  You don't want the transister actually touching the heat 
sink.  A small bit of silicon grease is used between insolator and 
transister and between tinsolator and heat sink to help with heat 
transfer.  I'll have to see if I can find the number, but if I were doing 
it, I'd go with darlingtons, I think e c g 247 or e c g 249 which are the 
same, but higher current.
73
Butch
WA0VJR
Node 3148
Wallace, ks.