I suggest that you get your serial numbers off the back and call Vandersteen they are very helpful and want you to keep your speakers working in top shape. Richard Vandersteen himself handles all service calls. He will probably try to get you to send the drivers back so that they can rebuild them but it is expensive and I'd see if they will sell you the foam at a good price.
First check the DC resistance of all the drivers, this will tell you if any are open or shorted, you can compare right to left if you're opening both sides. Edit: you're going to have to open the other side as it will surely need refoaming. They will need more work if there are voice coil issues.
The woofer looks to me like one from Brian Cheney, the founder and owner of VMPS. You could email the picture to him as he does support builders and moders.
The mid, looks like the old CTS-510 (similar if not the same as the driver used in the original B*se 901) driver but it had a cloth edge. It might just be built from the common parts, frame, cone etc. and it looks like they doped the cone and dust cap. Does that look like hard PVA glue on the dust cap? Edit: Not the same cone since the CTS-510 had a paper cone, that looks to be clear plastic.
I expect that the tweeter will be a 1" Audax check those also for DC resistance since they are also not the most robust drivers.
I'm curious to see the tweeters and acoustic couplers.