So reading the full stewards report reveals that Mercedes argued that the DRS was still legal when opened and only failed the test when force was applied which was a rule added by a technical directive rather than the technical specs. That the wing was within the technical regs, as mentioned earlier would have meant that they would have been allowed to repair the worn parts if this had been a regular weekend and not a sprint weekend. The car would probably been scrutineered after FP2 on a normal weekend and repaired for the next session. A mixture of bad luck that this happened this weekend probably compounded by the budget cap and delayed freight from the last race and possibly fatigue on the part of the mechanics.
No complaints from me regarding the disqualification as the rules were broken I feel it is just a shame that the outcome will probably mean the end of this most wonderful season of close nail-biting competition that I think any true F1 fan has really enjoyed. It would have been great to go to the last race with everything still to play for for both teams