Owners/service Manual problems of the 2009 Lincoln MKS

My vehicle is equipped with the thx sound system and for the past few months when starting cold there's been a loud cracking/popping sound when first started. Upon turning the car off then on, the system seemed to reset itself, however, now there's no audio coming from the system yet it shows on the equalizer that there should be sound coming out. I've done some research and found TSB 09-5-1 best reflects the situation that is occurring with my car. I purchased the car last summer and this was my first winter in the vehicle. Also, within the past 6 months, the left rear door will not unlock properly when using either the key fob or the manual unlock button. One has to have perfect timing when unlocking the door and pulling on the door handle for the door to actually be unlocked.

Two issues: the rear doors retain water after a storm and need to be drained by hand by holding the rubber flap at the bottom of the door away from the door itself. The locks randomly do not fully unlock when you use the key remote, the unlock button on the door, or even manually pulling on the lock knob. The lock knobs jump up and down and you have to try to open the door handle at the perfect time to catch the lock open in order to open the door. This problem seems to rotate through all 4 locks for random intervals and with random selection. It always seems to be on at least 2 locks at any given time.

Vehicle does not have an automatic shut-off, if engine is left running. My mom died from carbon monoxide poisoning in April 2013 after she failed to stop the engine with the manual shut off button. She was found in her bedroom, which is next to the garage. The car was stationary and in the closed garage. I do not have the VIN number, as the car was sold in 2014. All vehicles should have an automatic shut off after twenty minutes of running.