Short answer: I need...
1. Real cost (measured and trustworthy)
2. Lost production (we better know!)
3. Accurate RCE (with a QA program)
Here is what I would do with it:
I would see if we had any repeating and substantial “lost production” events during the last 5 years. Gather all “real” moneys attributed to the machine repair and reduced production. We need to ensure the root cause is accurate! Then I would apply up to 10% of the $$ to the best proactive measure identified in the RCE.
Holy bottle necks and barriers batman!