problem solved, at least for now, as i said I had one idea...and looks like I was right. The problem was in the instrument cluster, resoldered all ICs,but the main suspect was the cold joint at the 7ch darlington sink driver(there are 3 such ic`s) they control when the LED turn on or off(simplified)...

Hello, need ideas/advice on what to check with the car....volvo v70 2.4D 2002. The error is Urgent Service - brake fluid(originally is in Dutch so maybe translation is not very correct (REMVLOEIST. LAAG SERVICE SPOED), and red light of course on the instrument cluster What I did: checked fluid level...