ConcreteDonkey

I've had my 2007 A3 for around 10 years. Around a year ago the remote central locking stopped working. Tried replacement batteries but no joy getting resolved. Decided not to fix it further as it still opened from inside once the ignition is switched on. More recently though, the front passenger door will not open with the rest of the doors and must be done manually from inside the car before it can be opened. The final straw is the boot. It became intermittent opening and as of the last week it has now just stopped entirely. Again, manual release does work. I tried an OBD scanner and there were no fault codes. Hope someone can offer some suggestions as I love the car but it won't pass MOT next year if I can't resolve this.