To answer your question, are there KNOWN rear bearing problems on the 07 Edge? Yes. There is a bulletin regarding the problem.
Who did the work? If they didn't deal with the problem properly, then the bearing will fail again.
Here is the info on the bulletin. Unfortunately, if your vehicle is/was out of warranty, then it will be your cost.
Drivetrain - Growl/Howl From Rear Hub Area
NOISE FROM REAR WHEEL HUB BEARING - BUILT ON OR BEFORE 12/4/2008
FORD: 2007-2009 Edge
LINCOLN: 2007-2009 MKX
This article supersedes TSB 09-26-5 to update the Parts List.
Some 2007-2009 Edge and MKX vehicles built on or before 12/4/2008 may exhibit a growl or howl type noise coming from the left and/or right rear wheel area. This could be the result of a faulty rear wheel hub bearing assembly.
Follow the Service Procedure steps to correct the condition.
1. If Workshop Manual (WSM) diagnostics identify a faulty rear wheel hub bearing, it will be necessary to replace the rear suspension trailing arm/knuckle assembly along with a new rear wheel hub bearing assembly.
2. Refer to WSM, Section 204-02, for rear wheel hub bearing and trailing arm/knuckle replacement. Only replace the rear suspension trailing arm/knuckle assembly and rear bearing hub on the side with the concern. Failing to install a new rear suspension trailing arm/knuckle assembly when installing a new rear bearing hub assembly will result in premature bearing noise/wear.