It appears that the replacement part is 2475DA1. It looks like it still supports X10 and woudl be even dual. However, in my setup I need the receptacle hinges to attach it to box. It looks like the new one does not have the "hinges" anymore?
Some of that is probably the semi-clear component glue they use to fastened the capacitor to the board for a secure mounting. It seems to get brown with age and internal temperatures. I have that in many of my older Insteon Modules.
Can you see any bulging on the capacitors or the rubber seals on the bottom leaking or popping out?
I would suspect the 470uF/35V capacitor in your photo. I had the same value capacitors fail in some 2456S3 ApplianceLincs. One started pulsing On and off at a 60 cycle rate. I have also had a 30 Volt Zener diode short in a 2456Ss.