4c080be seemed to swap the LED pins for the 20130602 and 20140521 variants. 20140521 is fine now, 20130602 untested but per the schematics at https://deskthority.net/wiki/Costar_replacement_controllers it seems correct.
4c080be
* add optional support for Frosty Flake rev 20130602 * update documentation with instructions on building for rev 20130602 * support revisions using subfolders instead of preprocessor directives * rules.mk cleanup