| Date of acquisition | Signal duration | Time since last maintenance |
| Grinding table replaced on January 19, 2012 | February 2, 2012 | 10 min 51 s | 14 days | February 24, 2012 | 8 min 8 s | 36 days | March 1, 2012 | 8 min 8 s | 42 days | March 15, 2012 | 7 min 3 s | 54 days |
| Grinding table replaced on March 24, 2012 | March 30, 2012 | 6 min | 6 days | April 5, 2012 | 5 min | 12 days | April 19, 2012 | 6 min | 26 days |
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