The original kerfuffle was more to do with what was referred to as "cosmetic" issues by the PK brass. Apparently the EU bods were less than happy with the aircraft interiors, which were bordering on being dangerous.
methinks that there would have been a much faster response if it was engineering related. Cosmetic issues can mean a lot of stuff, such as broken seats or constantly inop khazis.
The PK aircraft do get hammered anyway, even the newer 777 fleet has suffered from the less than loving attention of Pakistani children who were trashing the IFE screens within a few days of the first ones being delivered. There have also been serious corrosion issues around the toilets of older planes, and regular infestation problems used to crop up at MAN with rats and the like.