I can positively state that there is a coma.
Anyway, for any pilot there is no discussion of the meaning: If something is not trustworthy, do not use it! Which leads you to the crystal clear conclusion, that you first have to find out what is working before you believe it.
Pilots do not read checklists like layers or laymen. Anyway one can safely argue that the AF447 crew did not read the QRH during their last 3 minutes nor did they understand its content.