Viewport settings have tricked me more times than I'd like to admit.

Wait, you cut your bill by $20 a week just from frozen veggies? That's wild... I need to check my freezer section again because I'm definitely not saving that much.

My buddy had a similar nightmare with an old Nikon. He spent a whole weekend on a "simple" shutter issue, just cleaning and re-lubing. Turned out a tiny piece of felt from the light seal had migrated into the works. He only found it after taking apart the entire shutter assembly. Now he just does a full strip on any camera that's been sitting for decades. It takes longer up front but saves those crazy hidden time sinks.