Tweezing

Hello, I bought my daughter a Mazda MX5 NA. approx. 120000km ; year 03.1998 ; the following problem we have. On Wednesday the car has occasionally chirped. Thought on some belt. lt. workshop the back storage. On Thursday we were able to pick up the vehicle. Price 645.€ …….on Friday evening the same noise again. Change the noise by clutch act and during the ride nothing. Does anyone know that or is someone who has an idea. Thank you Helmut