There are a number of Liver Presets that are possible:
M&L Protocol -
R03 Liver & Kidney
Detox\Terrain Single Steps -
R07 Liver - DB
R11 Kidney and Liver Toxins - DB
May need to just run one or more of these for some time to break loose whatever is in the Liver clogging it up.
For more details, please check the link: