93 ssei PCM / ECM

I checked the service codes on my Bonnie using the paper clip method. I got a 55 which I understand is the PCM / ECM. I see this is a $400 part. Can someone tell me where this is located? I want to check out the wiring around it make sure it is ok.

55 is EGR: one of the three valves does not work properly. This is not operation critical..except if you have to pass EPA test..or if it is blocked opened (rare) which would recirculate exhaust at idle and cause rough idle. If you have no adverse symptoms, it can wait.
www.avigex.ca/xport/3800codes.jpg
www.avigex.ca/xport/egr1.jpg
www.avigex.ca/xport/egr2.jpg
www.avigex.ca/xport/egr3.jpg
www.avigex.ca/xport/egrphoto.JPG

p.s: 55 is ECM with the 3.1 only
www.avigex.ca/xport/codes31.jpg

your ecm is under your dash behind your glove box. drop your duct work and you will see it, one bolt on strap holds it in.
How does yours run?