Depends on the problem. Your SOT should be handling this. Did he say why? If not, call him. It's nothing to do with you. Sounds like the seller/manufacturer did something wrong.
Just to close this out, finally got resolved. Turns out the distributor had accidentally submitted the same serial number for multiple transfers which put them in problem status, then ignored it for several months.
In the end the Form 3 took about 7 months, but glad to have it finished.