Joplin dropper proplem

After 3 years of faultless service my Joplin 2 (I think) is now sagging an inch or two when I sit on it, other than that it operates normally. I took it apart, cleaned and lubed it up but did not really expect that to fix, and it didn't.

I reckon the issue lies with the cartridge but I assume it is not as straightforward as putting more air into it. Any ideas?
Don have you tried eating less pies?

We all seen you at the agm attack those pizzas....

Much like this lady

This isn't the freaky forum Adrian, this a serious post about a serious issue, and the rush for the AGM pizza is one of the great EPIC traditions!
Don, i'd bring the seatpost over to Alfie's for a service, if they can't fix it then you'll need a new one...
anybody I talk to says they are ****..like Graham says though, if Robin can't fix it then its a bin job.