I tried making an ale clone of Sierra Nevada's Summer Fest lager. 3+ weeks in the primary and then into the keg for 19 days to carb using corn sugar. Now it has been cold for 3 days and I am getting that some green apple aftertaste which may imply that I stopped the fermentation too soon. I didn't notice any signs of infection so I am wondering if there is anything I can do to save this kegged beer. {Should i just give it more time? Should I pull it out of the keezer during this time?}