124c 300ce Rear headrests??

[alex300ce]

Hi, another little problem that Ive come across!
The rear headrest drop on my 300ce hasn't worked for the last few months.
The other day i had a flat battery after leaving the car unused for a few days, when i jumped it the head rests fell down! When i tried to pull them back into position they wouldn't stay up?
Tried it again today and they clicked in, though 20 seconds later came down on their own. Again they will not stay up.
Have had a quick look but thought it will be much faster to see on here if anyone knows the solution to this problem.
Bit more info...
there seems to be air leaking on the fuel filler flap lock and it seems to pump air for about 1 minute after unlocking, not sure if that is related?
Any help much appreciated!

 

[Indyz12]

The air lines are different to the central locking.
The air line you need to check runs under the carpet and under the rear seats. Pull the seat off, and check the vacuum switch. Most likely the air is leaking there or at the base of the headrests. Good luck!