We have a 6560 tank, 1 year old. Never missed a beat last year. Tank 4, granular fert blend rates would drop. Then two night ago electric magnetic clutch would not even engage yet u can turn metering auger by hand. Replaced clutch, seemed ok. Today, 50 acres in the morning not a problem then everything starts fluctuating. Can turn all metering augers by hand with product in, some a little harder than others. Seems ok when you first start for 10 seconds rate will lock on and then they start bouncing as if they slip out. Today changed 3 more clutches, ecu, no better. Have been through every service guy we can get in touch with, no great solutions. Next, drop all products out of tanks and see if they slip or meter with 0 load. If I can turn by hand u would expect machine should be able to turn them. Any ideas experience with this?