w140 ABS link to speedometer ? woes

[sprocket]

hello all,

my w140 (300se) has been acting up recently.

About 5 days ago the ABS warning lights came on, so i took it to the local mechs and they cleaned the ABS sensors.

everything was working fine until yesterday, when the lights came back on again.

this time:

1. ABS warning lights on
2. Speedometer wasn't moving.(RPM meter works though)
3. The steering wheel becomes tighter(power steering is there, but the steering feels heavy) when the car is moving.(it's alright if the car is stationary.)

does anyone know the cause of this?
can anyone please help me out here?

thanks