All due respect, but I have never had a Carver come back with that joint failed again. Possibly you saw one production run because they would definitely have put out a bulleton on this. Even if they didn't, I used to talk directly to the engineering staff and service and this was never mentioned. The joint did fail in many units. Our fix was to desolder the joint and redo it with a touch of flux. The amp may be back blown, but never that joint again.
I have seen amps where a tech had cracked the side off the cap and / or destroyed the traces, but that's all for that cap in particular. If it makes you feel better, replace the film cap with another of similar value. Using adhesive to couple the cap to the board will help keep the joint from cracking again. Djk, perhaps this step was missed?
-Chris