I cannot help right now with the actual issue, but as I’m not sure what label you meant, just mentioning: You can find the IMEI(s) both at the slim inside wall of the battery tray as well as on the back of the blue/cyan slipjacket of the original white box the Fairphone 3 came in.
P.S.: Not meaning to silence you here, keep this post active, it might still get replies from others.
Unfortunately just bending the phone doesn’t seem to fix the situation if it is a problem with the PMI632 chip.
Would you happen to know if the charging LED is part of the core module or if it is part of the display module? The last troubleshooting step that I can think of (Aside from replacing the PMI632) is taking off the display and reapplying it.