On my friend's 2000 Camry, the
rear light failure warning light on the dash came on. He found that the inside taillights (the taillights on the trunk) stopped working. He changed the 3157 bulbs with new ones and the tailights still didn't work (the brake lights still work on the same bulb). The outside taillights (the ones on the body) as well as the side markers work.
All 5 brake light bulbs (2 on trunk, 2 on body and 1 High-mount) work, reverse lights work, license plate lights work.
We checked the appropriate fuses, they were all fine. We are baffled

. Anybody have an idea what may be wrong?