I’ve got a 4 car group of TAC50-04’s, 32 bit CPUA with DAF380 gearless machines. 26 Floors. All 4 cars have noticeable vibration issues. I've heard from a mechanic that previously worked for tke and he says that there was a bulletin for the DAF380 machines stating something to the effect of there being an issue with the “rotor shaft and keyway connecting to the sheave” but he has no documentation to support this. He says there was a bulletin or recall on these machines but it was a small number of them that were affected. I can’t find anything on this. I was wondering if anyone on this forum has heard of this or has any familiarity with this issue. Thanks