Grinding noise under the timing belt cover

Hi together. So far I was only a handy reader in this forum, but now I have got a problem with which I need some professional advice. My wife has found today a strange creek at our Omega B Caravan year 2000 2.2-16V 125000 KM. When opening the bonnet I was able to locate the noise closer , it comes from the timing belt cover . It is a grinding noise , which occurs about in a second time and with increase of the engine rotation fence . l just intensified. The timing belt with wapu. and tensioning roller were changed in January of this year ( mileage since 18000 KM) With my noise I then drove to the FOH and asked him for an interim diaknosis, and for an assessment whether I can still drive with the vehicle. The statement, with that can be anything possible ( tensioning roller, water pump, belt cover) I can still let myself, because he has not disassembled the vehicle. But with the statement I can still use the vehicle without hesitation , until workshop appointment in the new year is something to me. As I have read here in the forum many times the timing belt is probably a weak point with this vehicle . Therefore my Fagen I can really use the vehicle without hesitation. I still have warranty spell from the timing belt change from January of this year , if it should be one of these components . Gruss