Firefly library missing songs after drive disconnect

Hi to all, I use itunes and firefly together, and use firefly to read the itunes database in rather than my music folder (I like the playlist control in itunes). All music is stored on an external drive.

Last night, some nugget unplugged the external drive, and since restarting the PC and reconnecting it, Firefly only finds songs that have been played within itunes since the drive’s been reconnected, almost as if 8000+ songs have been flagged as missing and aren’t flagged as OK until itunes next plays them. My question : is there an easy way to tweak this flag on each song in the itunes database so that firefly will import them?

Thanks in advance
PG