Tannoy DC3 crossover schematic needed!

Hi, I have a pair of DC3s and the super tweeters don't seem to be working. I unbolted them and tested them and out of the housing they work fine but don't respond when hooked up per instructions (yes I tried the jumpers on and off). The other speakers work fine as well as the concentric horns. After opening the back of one speaker I noted that there are two parts to the crossover, the one attached to the super tweeters is secured to the bottom so I can't really inspect it. I was hoping someone might have a schematic so I can attempt to troubleshoot them. thanks!