Citi Bike tracks the performance of its bicycle fleet based on an estimated 'mean trips between failure' (MTBF) per bicycle and per bicycle component. If you were to see a dip in the MTBF per bicycle for the past month, what are some approaches you could use to better understand the source and scale of the problem, and what potential solutions could you suggest? Assuming you have access to any data sets, what in particular would you be looking for and how would you want it to be structured to make analysis as straightforward as possible