My R1 and R2 and L1 and L2 not working!

Hello!

I have DualShock3 I use it for 1 year mybe..

One day I try to use it and I press the home button and it doesn't work!!

I try to open the consle and fix it

It's work good but the r1, r2, l1, l2 not working!!

I go to store and tell him..

and he tell you must change all the paper button because the consle crash!!

i think he is layer because he told my give me 17$ and I will fix it

Any idea about that :(

please guys help me...