If a bulb has poor or no contact, this may be because the power is not getting past A
(you can feel with a finger: if it gets hot there, then there is poor contact).
If so put a wire from the bottom up through B and an existing hole or one you drill up,
and solder the ends (scrap clean with a knife where it shall be soldered).
Move the pointer over the images for a closer look.
Connect the circuit boards, put the power on and check if there are voltage losses at any of the bulb sockets.
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