I currently have a 1992 500SEL that needs an evaporator core, closing assist pump, transmission (will not go in reverse)rear window regulator and radio repair. The evaporator job goes for $4K, trans. probably another $4K, radio will be $600 for the 7 channel amp,$120 for the head unit and $250 to fix the rear window. I hope that the repair CD will address and resolve many of the electrical problems. I know that I can never leave my keys in the car because I never know when the car will lock itself. BTW, just spent $3K on timing chain, guide rail and power steering resevior replacement.
Outside of warr. repairs are expensive unless you are Bill Gates.