I just moved into a new apartment and the bathroom is brand new. I noticed a screeching noise(like fingernails on a blackboard, ouch!) that last for about 30 seconds when the toilet is flushed and was wondering if this can be fixed. Thank you.

I just moved into a new apartment and the bathroom is brand new. I noticed a screeching noise(like fingernails on a blackboard, ouch!) that last for about 30 seconds when the toilet is flushed and was wondering if this can be fixed. Thank you.
Call a plumber