They do, say 3 sectors per day, and 1 "daily service"
On the BA A319s the fan cowls are not routinely opened until the weekly check. The engine oil is checked every night, but there is a good access panel for that. There is rarely any reason to open the fan cowls, except for the weekly check of the IDG oil levels.
On most engines, there is an access panel for the IDG oil check, but not on the V2500. I wonder if a modification to fit an IDG service panel would be justifyed because it might stop the next cowl loss?