The dealer will probably be not happy with me...
Inside there are 6x 1000uF 10 Volt caps on the DC-DC board. Change these with new ones, 1000uF 16Volt.
The old ones are defective.
About the external PS. Smash the casing gently on a solid table or rock..
The glue needs to break between the 2 halfs. This PS isn't screwed together, so will have probably some minor damage. But he, another PS costs more.
Inside the external PSU there another 3 caps with also 1000uF/10V each. You have to change these also. You can place 4 caps if you will.
The cost are about 10 times 0,75 euro, so that's a bit cheaper.....
You only need to solder. But these caps are sold in the most common stores for electronic parts.