Sue did the roller switch out a week ago, and we noticed some thread breaking and problems that shouldn't have happened. and she followed the instructions correctly, along with all the comments I printed out from here. Tech was up tuesday for total overhaul...asked when the rollers were changed, and said he saw no sign of grease at all on them! Sue had thought she did it right-minimal amount-but evidently it was TOO minimal! He went through completely and took them out, regreased, etc.and showed her exactly how much to use. So get ahold of a tech or someone that has done it right, and doublecheck everything-just having 'not enough' grease was as bad as 'too much' grease. Since the tuneup, wow, does it run better than ever! Roland