Sounds serious. Without looking at the car, it doesn't sound like something the uninitiated should attempt. Perhaps someone on this sight can point you in the direction of a good independent shop. This may need additional inspection on the rest of the suspension. You also may think about towing this ...

I like the idea of the cylinder blow down to find out were it is leaking from. Remember to do a wet compression test (little oil in the cylinder, table spoon full or less). If you have a leaking valve or ring the readings will come up two to three fold. At 100k it may be due for second timing belt ...

I would recommend using brake clean to remove the antifreeze from the wiring harness. Spray the brake clean only on a rag and wipe the wires with the rag. Spraying directly on the wires is not a good idea. Make sure to remove and replace any wet electrical tape. This will help to prevent adhesive ...