Hello, My 15 years old BeoVision 7 55 always worked perfectly until recently. After pushing power ON, slowly flashing red light and 1-2 minutes delayed start up. After that it works perfectly. Took power of for 1 hour, after reconnect had to provide PIN, and starting time delay was ~50% lower than before. After some internet digging and ChatGPT help, I suspect aging capacitators.... How can I confirm this "diagnosis"? Can it be repaired, if so, what are estimated costs? Kind regards, Stef