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You've done some of the troubleshooting, good.
1) check the contacts on all bulbs which light up, making sure all do light up. (each bulb in/out 4 times)
2) check the connector on the switch to turn the lights on/off. (VOM ohms between the ON terminals should be 0.)
If all are good, keep checking. Remove all the light covers. Take a pencil and tap the eraser against each bulb, looking for the flicker. (It could be a broken filament which momentarily disconnects causing bright/dim/flicker.) Check the grounds if the bulbs ground at the light housing. Pull the fuse for the cabin lights and reinsert several times. If there is a relay for the cabin lights, check its ground. The last thing I can think of is to support the wiring which goes to the manual switch for the lights. Add a wire tie if it's loose, remove a wire tie if it's too tight, moving it back until there is no strain.
 
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