Are you aware that you can get a complete car for circa £3000.00.
Just to be clear, only trying to help and perhaps a reconsideration of your asking price may expedite a sale.
Water and or fluid contaminating the alternator is not a good plan.
The PAS fluid may also be making the belt slip.
Pre owned fully working alternators are in stock if required.
Alex.
It effects all cyls, not just 5 and 6.
Remember that any slight indentation or unevenness on the tubes can cause a fluid leak.
The tubes are easily replaced and only cost a few pounds.
AP or Stoptech should certainly be considered.
Choice of pad compound is equally important.
Remember the bigger you go, the more you add to the unsprung weight.
Clear the codes and carry out the resets and clear the EML.
If EML comes back on, do the pedal dance again.
Reluctant to advise on drivability until 100% sure what the issue is.
Crank spigot bearing, gear box fluids and clutch fluids with complete the task.
Perhaps an upgraded pivot ball, spring and washer, might also be a plan when the box is out.