An A/C is not airworthy when a problem reported has not been properly solved and signed-off (You can find this on Regulation 2042-2003, which includes Parts M, 66, 145 and 147). So, if the A/C did not have its CRS issued following a maintenance action, it is not airworthy and the pilots can not take the plane. I don't remember who said it was the pilots faults, I think if it comes to be true (which I believe in) Those pilots are in fact responsable, and so is the company. Responsability on those workers side, because they should know better than to take an non-airworthy A7C up to the air, responsability on the company's side, because they should not put comercial pressure on either pilots or whoever, safety wise.