Actually, there are several things of concern about your Time Capsule.
The A1409 vision was introduced in June 2009 and discontinued in June 2011, so your Time Capsule is at minimum about 8 years old and as much as almost 10 depending on when the product was placed into service.
The average useful life of this version of the Time Capsule was about 4-5 years, so you have had very good luck with your product. But.....you would not want to continue to keep any data on the Time Capsule drive that you cannot afford to lose because the hard drive is frankly going to fail soon, and may already be failing based on the solid amber light report, which is the usual symptom of a drive that is beginning to fail.
Likewise, the power supply and other components have already started to head downhill. A solid amber light can also be a sign of an internal power supply that is on the verge.
There is another particular issue with the A1409, and that is the main circuit board was prone to poor solder connections. So, as the Time Capsule heats up and a tiny solder connection expands, things can act up, and the same solid amber light will appear. After the Time Capsule cools off, things may work OK for awhile, but the problem will usually surface again.
It is possible to open up the Time Capsule, pull out the main board and "oven bake" the board to reflow the solder connections......a procedure that LaPastenague is an expert on......so you might want to wait for more details from him.
Unfortunately, even if the issue is the circuit board solder connections, the hard drive is still overdue to fail. So, if you decide to "oven bake' the board, it would also make sense to replace the hard drive as well.
If it were me, I would not perform this type of major work on an 8-10 year old product, and simply retire the Time Capsule. As long as it is working, and you value the data on the Time Capsule hard drive, you can copy all of the data on the Time Capsule drive over to another USB drive for safekeeping.