Had a gas smell inside drum during use and from outer vent.
1) Cleaned filter/screen with soapy water.
2) Disassembled and removed filter/screen chassis inside drum for access to chassis sump and front of duct.
3) Removed a surprising amount of debris; lint, coins, bits of paper of about a 1/2 cup in volume with some density but no actual blockage.
4) Removed and cleaned vent tube from back of dryer to wall; nothing of note.
5) Rubbed and vacuumed internal duct from filter/screen chassis to back of dryer; nothing of note.
6) Reassembled.
Ran a load. Seems fine.
Thank you for posting.