Sunroof dropped W123

[240W210]

Hi,
The manual sliding roof on my 83' 200T has dropped at the back by about 7mm so it no longer sits flush with the roof when closed :-( Has anybody had this problem? and if so how was it fixed?

Thanks in advance
JON

 

[Mercedes cozy]

Might need some grease and may need some ajustment.

 

[240W210]

I think I'll get a body shop to have a look. I love this old bus so much it's ridiculous!!!