It could be leaking light, yes. It's the same model of camera that took the classic picture of Zappa yawning - was it at Woburn Abbey? It's also the first production camera - I think - to have through the lens metering. Looks like Clint Eastwood does in those old films.
If I had an open choice of a new camera it would be a top-of-the-range digital Olympus - it would complement my little Olympus Trip that never goes wrong.
I took a lot of black and white photographs of stones, in the mid-70's, on a Brownie box camera and then destroyed the lot during my Saturn Return. I'd like to see those images again !
~