My son's 2003 Jetta Wolfsburg has a very stiff trunklid. It appears that the gas struts are very tight. I assume they are the originals, but they are a bright silver so I wonder if they were replaced at some point... Are there any adjustments that one can make to the struts to loosen them up, or do you just replace them? Dan D '04 A4 1.8Tq MT-6 Central NJ USA