Hello partner, indeed the problem you mention has only two possible guilty.
1º The warning switch that, although it does not seem like it, if Peta also leaves you without normal intermittences.
2º The intermittenness relay.
The Warning button does not need to tell you where it is because it is red and has a triangulite (it is a joke).
But the intermittence relay is the one that is hidden, it is normally next to the fuses under the steering wheel, it is a relay that has only three terminals, one in the horizontal center and two vertical. The boat is square and somewhat longer than the rest of the relays. And it seems to me that it will have a number on top.
I have no figure or photo to pass you the exact location, what you can do is go to the scrapping and "loot" of a Córdoba, Ibiza or Toledo the Warning button (and thus you take note of how to disassemble it without loading anything) the fuses (very helpful always) and all the relays you see inside the car (they are worth you for something).
Incidentally you get a few lamps to have them spare and with a little luck you go through the door making a "simpa".
When you get home you change the Marras relay and ... you will see how it is resurrected.
A much less shabby solution is to go to a spare parts house and ask for the intermittency relay or the warning switch, but you have to be sure of what broke because it is more expensive of course. (Although I have to admit that it is the best option when you know what is broken).
All the best.