:There is an article on here about restuffing the boxes with new modern capacitors. Or you can cut the wires to the box and solder new caps in the radio where u clipped the wires. just be sure that u do not leave the old box cap wired in the system if u doit this way. If u want to keep it looking original, restuff the box. open one end scrap out all the inerds, and replace with mmodern caps. watch polarity of the caps and connect the corresponding wire to the cap. Some one else here may be able to explain it better.
:What are the numbers on the sche matic for the caps? C? maybe i can understand better if i new exactly what caps are leaky. Check them with an ohm meter, when u touch the leads the needle should swing up then go back to infinity, if it lingers any where above infinity after a few momments when the cap is done charging then it needs to be replaced.