Jenson Button will not be penalised for running with an activated DRS outside the zones in first practice as it was a malfunction.
During Friday's first practice at Monza, Button was spotted outside the second activation zone with his DRS open until after the Parabolica.
The stewards immediately launched an investigation with some concerns being raised that Button could be penalised.
However, as it turns out, the open DRS was the result of a malfunction.
McLaren sporting director Sam Michael told Autosport: "We had a problem with some parts that were fouling on each other, so we had a clash of two different things.
"It is because we don't run this wing or actuator anywhere else as it only runs at Monza.
"It was pretty straightforward to fix it, and we came in and pulled the parts off the car."
The stewards accepted McLaren's explanation and opted not to penalise Button.
"The stewards accept the evidence tabled by the team that, despite the DRS being shown as deactivated at the end of the first DRS zone (braking area for Turn 8) the hydraulic activation arm jammed against its carbon fibre cover, preventing deactivation of the wing element," the stewards' report said.