If the wine has been stored at 55-60 F, it's likely it was too cold for the MLF to complete. You should be storing it at 70 F during the MLF phase. Also, MLF will be very slow if the pH was less than 3.3 or if you sulfited the wine. Weekly stir of the lees also helps drive MLF to completion.
I have some questions for those of you in warmer climates who want to have better (cooler) storage for their wine aging and storage needs but don't have a lot of time or DIY expertise to do it themselves AND don't want to spend a fortune on the typical commercial or custom solutions.
I am...