- first communication with Central Spain, "sector Toledo",# frecuencies SectorToledo 133.75 381.25# in which the pilot (in a very bad communication quality due to extra sounds and statica) said there were PRESSURIZATION PROBLEMS.
Speculation from my side. The poor communication quality may have been the result of wearing the Oxygen Mask. However, the O2 bottle may have been depleted or shut off valve closed. Known to have happened, even in the airline world.