Gert a box of spare bulbs for all the different bulbs in your pin. Then just replace the unlit bulb with a new one. Simple enough and you won't be wondering if all your bulbs are bad.

I'm a firm believer in having the service manual for every pin I own. It just makes troubleshooting and repair so much easier. For most pins you can download decent copies from IPDB. For Gottliebs, Pinball Resource. Ebay can also be a source.

I also have been fortunate that most of my pins have come with manuals. Early System1's usually have the manual with the game wiring and info but no PCB schematics.

Do yourself a favor and get the Manual. Another benefit is that some manuals contain "Theory of Operation" and this can be a big help in learning how to troubleshoot and repair your Pin.

Not sure what you are saying.
Put new 67s and they still don't work?
All the old 67s were blown.. how do you know that?

You need to get a DMM(meter) and then you can measure the fuse for continuity.(~ 0 ohms)
You don't need anything fancy. Harbor Freight has them for ~ $5. Sears has them on sale for ~ 10 to 15 at times. Home depot, lowes, radio shack. Get a meter.

Or you could make a continuity tester using batteries and an led or buzzer, sonalert, etc.

So in Diagnostic mode you could get the 67s to work and flash but in game mode they do not work?
Do you have clay's guide for System 3?