Older lamps last long, that's true, so was this ceiling bulb. In 90% cases of failed bulbs, LED is the only part which goes off. That's why I gave a shot myself and found the damaged LED.
LED bulbs are repairable and as I mentioned 90% cases only LED is damaged. Since they are all in series, we can either replace with new one os just short tho points.
Since LED desoldering and replacing is tedious process, I shorted the two pins of it. So although I had one less LED but the bulb still works.