HP LaserJet Pro 300 Color MFP M375 - Manual (Page 277)

4. If you can not see any jammed paper, lift the
duplexing unit using the tab on the side of the
duplexing unit.
5. If you can see the trailing edge of the paper,
remove the paper from the product.
6. If you can see the leading edge of the paper,
remove it from the product.
7. Close the rear door.
ENWW Clear jams 261