Pinholes on HP5+ neg developed in PMK Pyro

I've just finished developing an 11 x 14 sheet of HP5+ in PMK Pyro, and one edge of the sheet has numerous pinholes that print out with a pepper like appearance. I used the following procedure: 3 min. pre-soak; 15 min. development in tray with continuous agitation, lifting each side and end of the tray consecutively(one sheet only in tray); 2 min. rinse in water; fix for 4 min in TF-4; wash for 20 min. The extended development time is due to the fact that I print pt/pd. Would like to know what could cause this.

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