You should probably start your own thread, but it does sound like you are having Solenoid board issues. Check all fuses, get a multimeter and learn how to use it. Check for continuity and burned connectors etc. on the solenoid board. Stare at the schematics for a while. Ask questions and follow up on what advice you are given.
You can probably find the .156 pins and connectors at Great Plains Electronics, or maybe some other pinball parts places. You can probably tell if the connectors are burned up. I wouldn't start replacing things without testing them first. I like to get a game running at 95% before trying to get it to 100% if that makes sense.
There are replacement Solenoid boards available, but it sounds like you need to track down where your problem is. Get the manual from IPDB (http://mirror2.ipdb.org/files/1476/Bally_1977_Lost_World_Manual.pdf) and do some of the tests with the buttons inside the coin door. I bet that you will find that with a little poking around, you will learn a lot quickly.
Start your own thread so you can get the help you need. Most of all, Welcome to the club!