On most Tac20s the BPs go back through LON. They started to change it on the newest ones because it was a problem. The best solution is to get them out of LON. You can intercept the discrete wires between the CWIK card and LN card in the COP and send them back to the machine room on spare travel cable wires. Then add the IOs in port 7 or 8 and delete the IOs in LON.