[Manco]

Just found a hidden code, see above post!

EDIT: The code reads:

eblmxg yhk fx

This is encoded with a Caesar cipher.

I think the “19C” means it is a Caesar cipher (the C), and that it is decrypted with 19 “shifts” through the alphabet.

Doing so (with this online decrypter, shift 19) gives the following:

listen for me