Squawk 7700 on UAL3358

Does anyone know what the emergency was on this flight? UAL3358

flightaware.com/live/flight/UAL3 … /KEWR/KBUF

You known it actually squawked 7700 or was it just dump1090 stating it? I get it on dump1090 all of the time. I check another one and it is not there(I have three).

I believe it was real. Listened to communications between BUF & 3358 & BUF giving priority to 3358 referring to it as emergency aircraft