There is no loss of SOC or any USN floatplane in North Atlantic listed between June and August 1942 by the site, that has lists of oversea USN losses:
http://www.aviationarchaeology.com/src/USN/losslist.htm
But the list is not complete, so you can keep searching...
Edit: the rather detailed Wichita story below indicated that two SOC Seagull took off on 4 July and both returned.
http://www.history.navy.mil/danfs/w7/wichita-i.htm
Edit2 (I'm typing faster than I am thinking today):
The War Diary of USS Wichita for July 1942 is available on the fold3 website:
http://www.fold3.com/browsemore/hsEU...QFQnTjteDV_-1/
You have to register to see it.