Hi, I have a 2009 Range Rover sport tdv8 and have not long changed the shock absorbers aprox 1500 miles. Just been for test and failed on shock absorbers particularly the left front and rear, there is no oil or visible signs of a leak and it does not feel any different while driving?? I’m at my wits end and am asking is there anything else which would cause a low reading on the test??? Thanks in advance for any help .