Manifold/header/muffler/tail Pipe problems of the 2005 Ford Crown Victoria

I was responding as a volunteer ambulance emt from my residence to the fire station for an emergency call when the steering locked up. I tried to turn the steering wheel back and forth while applying the brakes and it began to steer again. I continued to the station about 3/4 mile away, made the ambulance call. Upon completion of the call I lifted the hood and observed the lower joints of the steering shaft were rusty and corroded. I sprayed the joint with wd-40 and turned the steering back and forth. In preparation for a trip two days later I was checking the vehicle and found the "exhaust heat shield" lying on the frame between the engine and frame. It was then I figured the part had come off and jammed between the steering shaft and the frame causing a momentary loss of steering control. I have not replaced the heat shield. After a factory recall replacement of the lower shaft resulted in the car steering like new with very little effort for a month or so. I then noticed the steering seemed to bind again at times. I looked and the upper steering shaft is corroded so I sprayed the u joint contained in the upper shaft with lubricant. I contacted the dealer who said the upper shaft was not part of the recall so I called Ford and was told the same thing. The upper shaft joint is experiencing the same failure as the lower shaft. Corrosion in the u joint is causing the needle bearings to not operate properly resulting in more difficult turning of the steering. I lubricate the joint at times. I believe the "upper steering shaft" should be included in a recall due to corrosion effecting the parts due to design not sufficient to prevent contaminates from entering the steering u joints. The "exhaust heat shield" was deteriorated due to corrosion of the mounting holes used to secure the shield to the exhaust manifold mounting bolts.