Mk6 Transit. Queries.

[2005mk6]

Hello everyone.
I am or have been a member before, but cannot remember my login details.
So started another account.
I have 2005 Mk6 2.4di Transit RWD, LWB Hi roof. ( Louise )
Couple queries, recently ABS & Handbrake light on constant, also the anti skid button illuminates when side lights on, but ( I think orange part ) when pressed / depressed doesn’t seem to do anything?
Checked fluids fuses relays wiring handbrake cable can’t see anything odd, pads I believe sensors where changed last year & plenty life left on pads n disks, wondered why seem to happen roughly same time.
Also I’ve managed over a period of time, changed my bland dash panels to ones with higher spec model electric mirror/ heated mirrors switches etc some plug in & illimunate when lights turn on / pressed but others haven’t, so I assume not got any use ( no spare plugs behind dash. ) I’d like to find out if or how I’d find out if I can add electric mirrors seeing as switch has live to it but would I have electric mirrors etc or where can I find a permanent live to wire in my own extra interior / exterior lights?
Thanks in advance for any info or comments etc.