If water runs into the toilet bowl, is it always the frame itself?

Usually not the steel frame, but an internal flush or fill mechanism inside the concealed cistern. That is a common local repair.

Can Geberit or Grohe systems be repaired without opening the wall?

In many cases yes. Proper systems are designed for service through the opening behind the flush plate, so valves and internal parts can often be replaced without breaking tile.

Concealed frame repair in Israel — hidden cistern, flush plate and leaks

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Concealed frame repair in Israel — hidden cistern, flush plate and leaks | KABLAY