You can manually rev the car (via the TB) to the IMRC opening point and watch for the cable to pull the secondary linkages open. The secondary linkage can be seen directly below the TB.
Another option, and a highly likely one, is that the plastic bushings that hold the linkage to the secondaries has shattered (very common...) I suggest doing a UIM/LIM teardown, and while doing so, if there is anything wrong with secondary operation OTHER than a fried IMRC, you will easily see it.
Ray
