toyota service will not repair seat noise

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Bad squeak in drivers seat. Loudness is worse when engine is off. When I reach behind and pull up on seat belt covers -noise stops. It seems to have started with pretensioner recall. When it went in for squeak complaint-nothing was done. Was referred to an upholstery shop but it is not the seat itself. What is my next step? My '07 Yaris only has 4K miles on it-I rarely drive but it is out of warranty.