when cold will not change out of 1st gear unless put in manual mode then after 4 or 5 miles when warmed up goes through all gears normally in any mode one repairer tells me it is pressure regulator another tells me it is fluid pressure valve. is there a difference and can anyone advise me on the sort of job it is to do? the car is a bmw 730 with zf 4 hp 22 transmission
