Front DT car A4 door not proven closed.TC opened and closed twice - ok. ~~~~~ #3627-A4 door pull/push gauge 10kgf, door mating strip 62.5mm. Found bottom door guide rail sticky. Cleaned and serviced door guide, pull/push 8kgf. Adjusted door mating strip to 63.5mm. Carried out door cyclic/function test ok. Done by Jack. 09/07/20.