Hi everyone, This is my first post on APUG and I'm hopeful that someone will have answers to my questions since I've seen the collective wisdom that's out there. I recently bought a second-hand De Vere 507 enlarger with the closed-loop colour head and installed it in a shed that I've been converting into a darkroom over the past while. It worked very well initially but I think that it has succumbed to the dampness in Ireland because when I switched it on recently, there was a bit of buzzing and flashing from within the head and, since then, it's no longer working properly. The two lamps are still lighting but the internal shutter doesn't open any longer and the filters seem to be parked rather than moving when adjusted from the remote keypad. The message on the keypad is that the lamps are blown but I think that the sensor is simply not seeing the light, so to speak, since the shutter and filters are seized. My questions concern repair of the head. Is it an operation that one could consider doing oneself or is it a job for a pro? Should I try to get it fixed by an electronics handyman or just bite the bullet and send it to Odyssey in the UK? Have any of you had similar experience with the closed-loop head? Perhaps I should give up on this head as being too complicated? I shoot B&W only, up to 5x4. Can more commonly available 5x4 heads be fitted to this enlarger? Lots of questions so thanks in advance, Conor.