The PW2040 used to have some issues with the 10th and 11th stage HPC stator vanes (cracks) and the 5th stage LPT blades (blade clashing, rotor blades against moved stator segments), but due to mods carried out during engine overhauls (replacement of the offending stator segments with a redesigned version and replacement of the 5th stage LPT stators with a redesigned version), the problems have been fixed. Up to the mods, regular boroscope inspections (a bitch especially on the 11th stage HPC, since there is no normal boroscope access to this zone, you've got to go in from the 12th stage and carefully thread the probe through the 12th stage rotor and stator with a high risk of getting stuck, happened to me once, the tip of the probe tore off when I tried to remove it, resulting in an unscheduled engine change. But I've heard this is a regular incidence in these inspections, so I never had any problem with the airline about it) were mandatory to catch the cracks and blade clashing as early as possible and to pull the engine if necessary.
AFAIK, the RB211 gives a better performance in hot and high situations, but the PW2040 is a bit cheaper.
Je Suis Charlie et je suis Ahmet aussi