コネクタが接触不良で、フィルム配線を挿し直せばいいだけなのは予想できました。
ただ、配線に封印テープが貼ってあったので、それを剥がすと保証が受けられなくなると思ってそのままにしてました。
有償修理になった段階でそんなのはどうでも良くなったので、好き勝手いじりましたとさ。
防水はなくなったけど、それ以外はフツーに使えてるので、もういいやと。
ちなみに家に帰ってから両面テープ買ってきてちゃんとくっつけました。
Z4の方は保険に入ってたみたいですけど、そういやタブの方は断った記憶が(^^;)

The connectors were making poor contact, so I could expect that I just had to reinsert the film wiring. However, the wiring had sealing tape stuck on it, so I left it be, figuring I'd stop receiving the warranty if I peeled it off. When it came to the point of paying for repair, that became moot, so I just tampered with it as I saw fit. It was no longer waterproof, but otherwise, I could use it as normal, so I figured it was all good.

When I got home, by the way, I bought some double-sided tape and stuck it together properly.

It seems I got insurance on the Z4, but come to think of it, I recall refusing it on the Tab. (^^;)