Has the female side of CN8 on PS board been rebuilt? CN9 not burnt?
Page 64 of the manual shows F4 protects the string with white wire with a brown stripe. Remove all the bulbs in that string, then see if fuse blows. If no blow, replace bulbs one at a time to see which bulb or socket is causing the problem. If it blows with no bulbs, look for shorts along the string and disconnect portions as needed to narrow down what's blowing the fuse.
And even though it was sent out, I would still suggest looking for cracked solder joints on PPB connectors. Specifically J5. No Tips in GI circuits.
Lake Elsinore, CA
