leaking single handle shower faucet

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Have a stall shower with a Valley single handle faucet (approx. 7+ yrs old) that has an occasional drip now and then even after not being used for a while(guest room) can it be repaired without damaging fiberglass shower stall (which would then have to be replaced) or having to open the wall behind the shower in the laundry area. I suspect it may be a bad washer but am not sure what is inside the faucet parts. Any suggestions?