Noises problem
2000 Peugeot 206

got a problem with my peugeot 206 1.4 lx.Had some screeching coming from the fanbelt area so i got out a mobile mechanic and he said he did not see a major problem with the fanbelt so he put some belt-slip spray and some de-greaser on it and it took the screeching away but one or two days later the noise returned so i spoke to my mechanic again and he said that it'll probably be the fanbelt tensioner and that he recommends replacing it and at the same time to get a new fanbelt.Just wondered if this sounded right or could there be some other problem.

Many thanks