Question about FPP X-ray film

I'm using some FPP X-ray film to try to find out which of my 4x5 holders has a light leak. I'm not concerned with the image quality/tonality of the developed negative; I just want to find the bad film holder(s).
I normally develop my film in D-76 and want to know if anyone has developed this film in D76 and could give me a time/temperature/dilution starting time. Again, image quality is not my concern.
Thanks!

For this purpose I'd just start with something like 6 minutes and dilution 1+1. Then adjust to taste from that starting point. Since you're only looking for a light leak you could also err on the side of over development and go for e.g. 8 or 10 minutes.
Note that xray film generally requires substantially less/shorter development than normal film, probably partly due to its lack of a top coat and soft emulsion. So if you were to take for instance the development parameters for FP4+ (random example), you should be good for your application.