Looking at the Wayback Machine, it looks like the last good capture of the website was August 13, 2015, and they were claiming 5 churches at that time.
Stratford Presbyterian, NJ
http://www.stratfordpres.org/spc-about-us.php (still showing ERPC affiliation with a dead link)(No Sermon Audio shown posted since 2013)
Salem Presbyterian, Burlington NC
(no webpage shown on the ERPC capture - Sermon Audio link shows recent sermons
http://www.sermonaudio.com/search.a...ubsetcat=series&subsetitem=Christian+Doctrine)
Covenant Family, Glenville NY
http://www.mycovenantfamily.org/CFPC/Farewell_to_CFPC.html (folded May 17, 2015)
Covenant Presbyterian Church Hatboro, PA
(no webpage shown on the ERPC capture; Sermon Audio account no longer active )
http://www.sermonaudio.com/covenantchurch
Grace Presbyterian, Hanover, PA
http://www.gracehanover.org/
So, one church that appears viable, one that is likely viable, and one which may be viable at the time of denominational dissolution, one known no longer viable and one likely no longer viable. Looks like the denomination may have just shrunk below viability.
Probably the best course of action would be to contact Grace Hanover and the one in North Carolina.