2001 Beaver Marquis. Transmission selector not working

[Vernon Boen]

I have a 2001 Beaver Marquis that wont start. I've been trouble shooting for some time with no luck. I have discovered that it will start from the mechanic button on the rear. I noticed the transmission selector pad is not displaying anything. I have replaced the solenoid and the key switch. I have chased all the wiring down and cleaned all connections and checked all the fuses. I have noticed when I turn the key on and off that each time I turn it back on the economy button on the pad will briefly flash. I also noticed when I start it from the rear that it does display a check transmission light and exhaust brake light on. I have the jake brake off but light still says on. I thought I'd post here for some possible insight. I am probably gonna have a mobile service technician come out and hook up computer in hopes of some direction since there's a check transmission light on that may point me in the right direction. Asking here first in case there is something simple I'm overlooking.or a fellow member who's previously had this issue. When I  parked it last  there was zero issues and I've never experienced any trouble with the transmission pad. Thanks in advance for any assistance

[David T. Richelderfer]

Your description of the symptoms is a bit different than my one-time experience but Kenny Carpenter (now deceased, Bend Beaver expert) guided me to look under the transmission keypad into a black clamshell box for a couple of fuses, one of which had blown.  He told me that to start the engine, the transmission must report neutral (N) on the keypad.  The clamshell box is accessed by removing the large side panel under the console just left of the pilot's left leg.