They've stripped out all the avionics from the F35s, binned them and are busy around the clock refitting them with new avionics in makeshift tents (hangars not yet finished) - what??
Seeing as the aircraft re-commenced flying four days after they arrived, that was either the quickest avionics retrofit in history or this comment is complete bolleaux.
I have heard that there are issues with the infrastructure at Marham not being ready (the jets weren't supposed to arrive until late August at the earliest, but the Centenary celebrations caused this to be bought forward with no real planning), and that ALIS is causing some headaches. But that's not quite the same as the hyperbole of 'stripping out' the aircraft's avionics.