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If everything is working fine, then you need to decide if it is worth the time and expense of repairing the circuit that leaves the light on when it should be off. I would leave it alone and if the lamp bothers you that much you can remove it or cover it with a piece of black tape.
First check the light bulbs if they are not the reason then, Welcome to the ford world, there is a thing called LCM (light control module in the grand marquis crown vics and lincoln town cars, sometime they go bad, your best bet before you look for replacing the LCM is to look for the headlight fuse and the relay, when you are sure it is not these two, then you can be sure its the LCM
I can tell you that we had problems with the1988 suspension bags and used Crown Vic airride parts instead. A dealer can tell you because they have a book called the "OSI" which stands for Obsolete. Superceded,and Interchangeable. The prefix on all Ford parts, Lincoln, and Mercurys designates the make,year, and model-but the next numbers are considered BASE numbers for the part type.
There are many good parts in Salvage yards. Also a true spring shop could help you because you need to consider the weight of the vehicle, ride height, etc. You might try the internet for listings under some type of conversion kit for the airride to spring setup.
With some luck you may be able to find an Autozone or Oreillys with a scanner for the suspension plug. It could be a sensor bad that aftermarket parts carry. Those 2 auto parts places scan for free if they have an air suspension scanner and you can always get Salvage parts to replace what they find.
Check with Autozone and Oreillys for pricing on the bladders. It is also possible to get Salvage parts from either another Marquis or Crown Vic. The $248 labor charge does not seem too high. You could check around and ask how many hours it takes and the hourly rate.
There are some businesses that recondition the bladders, but that is already admitting what they have went flat some time ago.
I had air bladders on a 1994 Crown Vic with 161,000miles and my 2002 Marquis has 47,000 miles on the original rear bladders. So it does not seem to matter the age or miles but the climate the car is operated in.
i think if there is a problem it would be if one had A.B.S. and the other did not, otherwise i can't see any problem. just have to look at it and see if everything lines up. i believe the boosters are the same, if they look the same and bolt up the same i don't see any problem. you might want to chk. with a ford dealer just to see if there is a differance in volume on booster.