We unfortunately did not manage the phone conference with the CAT representative yesterday, and the lead engineer being out today, will try again tomorrow.
Meanwhile, it would be really important to obtain the product CAT ET report. This would tell us, whether a dusty environment has been a long standing problem or an issue starting out only recently.
Could you please try once more to obtain that report for us to review. Possibly in English, cc:ing myself. Because if that information is considered confidential, then we still have a communication problem.