My 2013 Expy has had a problem of the gear shift not releasing from drive. Rocking the car doesn't help. The brake lights and brake light switch work. When the shifter is pulled to shift gears it sounds like a relay is making under the dash or in the steering column. But sometimes the shifter wont move. After while it does move but I'm afraid I'll get stranded sometime..I have opened the aux. port on the shifter to release the solenoid but it doesn't seem like there is anything in that little square hole to release or push down like a plunger. Help!