How can we ensure that MTTR / MTBF values are correct while doing Breakdown Analysis?

[mech_vishal16]

The reason behind asking this question is that recently I have carried out MTTR/MTBF analysis of around 1000 equipment of my plant and I have found around 06 equipment which are showing MTTR values are very higher side e.g., around 4 to 5 million hrs. even though plant started in Y-2009. Can anyone give idea why SAP is showing such a high value of MTTR? See below snapshot

[lenastodal]

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