OK, this is not a warning in a sense that a product is faulty. More like a mistake that's easily made and can get quite expensive.
In a flybarless-converted 700, the servos need to work much harder than in the standard flybar version. As a result, they tend to get hot.
In the 700, the elevator servo sits in a plastic enclosure, preventing airflow. It gets even hotter, stops working and / or fails.
This happened to me in Corfu with a 610 DS (failed) and a JR 8717 (temporarily lost torque), both at 6.3 V.
In that sense, the upgrade below might be a good idea if the servos are hot to the touch after flying. I ordered one today, but haven't tried it yet.
Fast Lad Performance
So what happened?
My 700 worked fine for several gallons in Finland on 20 % nitro. But apparently, the Corfu heat, 30 % Optifuel and me flying a little bit harder than usual (still like grandma... when she hasn't taken her pills ) were too much for the DS 610, which failed, probably with a broken poti.
Since the LiPo was discharged more deeply than usual, it seems that once the servos get too hot, they lose efficiency, draw even more current, get even hotter...
PS this happened with a Mikado V-Bar. People say that it makes the servos work harder than the Align system, don't know if this is true.