ESI RV622A Resistor Repair

[gmilliorn]

I have an RV622 that fails if standing on end, or if bumped laying flat.  I traced it down to one
resistor that has a "bond wire" detached.  It's hard to get a good picture, but the circled area
is detached from the resistor.

All these resistors look like the leads were spot-welded.  I don't have such a tool, is it safe to try
to try to solder the wire?  The end cap is pretty large and I don't want to melt anything.