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Hi Peter,
Has the bike been cleaned in the car wash with a high-pressure washer (or another strong water jet)? If so, water may have entered the K6 after all.
The K6 is IP67, which means that it is waterproof (30 minutes, 1 meter deep), but is therefore not resistant to strong water jets (not pressure-waterproof).
Once moisture has gotten into the K6, it is difficult to get it out. After all, this came into the K6 with high pressure.
Water from the car wash (probably also mixed with soap), and electronics and electricity is a guaranteed recipe for problems.
So I’m afraid your K6 is definitely dead.