In the absence of a U70 service manual, I can't see how to open up one side of the headphones. The left-side has become intermittent, so I need to open it up, and probably re-solder the wires. Can you suggest how I can open that side, as I don't want to lever off the metal cover and find I've thereby broken something.

Thank you, 

Mark
 

I'll have a look! I thought I had put the manual on - my mistake if I have not.

Thank you for installing the manuals, Peter. Unfortunately, they don't really show how to dismantle the headphones, as assembly screws are not shown... but glue is mentioned. I guess that I simply have to lever off the large metal cover on the faulty side, whilst trying not to bend it!

 Mark
 

No you don't! Just had a look at mine! You just take off the earpads (these have delicate plastic clips - be careful!) You then have access to the clips that hold the silver back onto the rest of the headphone. There are 4 of these and a small screwdriver to gently push these up releases the back. The speaker unit is then completely exposed. You don't need to force anything.

Oops!

Thankfully, I'm not at home at the moment, or I would have tried already. 

Thank you, Peter. I would have kicked myself otherwise.

Mark