I have been using my Persona for the last 10 days,so far:

2)The famous sound at the back seat,already solved by using PVC tape.

Got the car back yesterday

This was my original problems:

1.  Famous Persona klunking noise
2.  Famous aircon rattling noise
3.  Radio buttons on steering gone haywire
4.  New tick tick sound (from steering column perhaps?)

Here are the results after a few hours of test drivings

1.  99% settled.  Extremely minor (or was it my imagination?) klunking noise while cornering
2.  90% setlled.  The rattling till today cannot hear but the annoying click still there though less frequent
3.  100% settled.  Back to normal.  Dunno when it will fail again.
4.  0% settled.  Tick tick tick tick as usual.  Can't seem to find the blardy source!