At 1 year and 3 months the dryer rumbled badly.  Actually it started earlier but would then sound normal.  The first repair visit said there was nothing wrong.  The second visit the rollers were replaced.   I did notice that the back of at least one of the rollers was completely packed with lint.  Now lint collects on the back of the lint screen as well as the front.   Please have your repair person back to correct this.