Analysis of sales

I work for an engineering company in England
As part of an upcoming business case to upgrade a fleet of equipment I need to understand how much the existing machines are currently costing the customer to maintain.

We capture the data including parts and time onsite to charge the customer each month.
However we don't have the capacity at the moment within our business to analyze this data from the last few years into something we can present or use to support our business case and i was hoping this would be something you would be able to support us with?

We would like to be able to analyze, parts used, QTY/cost, which stores have the most breakages, and be able to see this per month and year