help is needed! I have a 1020 mfp with a sc400.. turn on the machine and machine initializes and pops sc 400. the code is not listed in manual. but does say 4xx is related to itb transfer so with that being said I did the following

1. cleaned tm sensor
2. cleaned contact sensor and checked contact motor
3. replaced complete ITB unit
4. check agitor motor it is free and not binded
5. reseated all connectors on all boards
6. intatialized epprom in engine maintance
7. set back to factory defaults

I am at a stand still with this....any idea or suggestions?