Gearbox Fault??

[sheltie]

Hi All,
XC70 diesel auto 2004 59,000 miles, fsh,

Wonder if you can offer any advice--
Symptoms are as follow's

Dash lights/instruments failed but ok after switching off for a while,
ABS warining on,
Brake failure warning has been on (engine would not start)_Warning on dash (anti skid needs service)
Several different warning's have been on and gone,
Local garage suggests gearbox is finished and should be replaced, I dont think so and need some help to trace the fault, there does appear to be some common issues with this autobox but if anyone can get me close the the fault !!

Effect----
Thump when selecting gear,
Occasional slip/high reving when moving off
Auto box behaves strangly but is ok at the moment

I need to know what the fault might be (tcm, abs) is it safe to drive or?

I've been a fan of older Volvo's for many years and have a wide experience of older models.