Need experts HELP~!!!

Dear Sir:
I am a PENTAX fan.I have three pentax SLR and many MF lens.MY father had a PENTAX ZOOM 60-X for many years .He had used it only several times and it looks completely new as if just come out of the box.We like it very much because it's excelent quality contrast with today's point and shoot cameras. But one piece of the lens(which before aperture) mildew now.I have no time go to other cities (no pentax service center in my city)and no reassurance to mail it for repair.I had repaired many cameras myself,so I decide repair it myself.Can you give me some information how to reach the piece before aperture with minimum open.

THANK YOU VERY MUCH. Waitting anxiously!
By the way,I am in China.

In the UK, I would suggest replacement rather than repair because the cost of a second hand 60-X would be very low indeed. Even a new Pentax compact of better specification could cost less than a repair.

Why not try eBay to see if you can bid for a replacement camera, perhaps for a very small outlay?

If you do try to repair the camera without specialist knowledge and equipment you may not find it too easy...

Best wishes

Mr Johnriley:
Thank You for reply! That is why I decided to repair it myself.Why I don't buy another one.It's a matter of emotion rather than money.