PAJ

Hi hope someone can point me in the right direction here ...... 2007 2.5 tdci Got just outside home today and cannot get 1st or 2nd gear with engine running or with it stopped.... 3rd, 4th, 5th and reverse all fine .... No noises, vibration other prior to not being able to get 1 and 2 ...feels like a mechanical obstruction ???? Any thoughts greatly received Thanks