Bottom line is tweaking voltages should be the first option for anyone wanting to lower their black level and/or remove red tint.
If tweaking voltages does not remove red tint or elevated black level, then reset becomes part of the equation since you are stuck between a rock and a hard place.
In my experience, I did NOT see an improvement in black level when resetting (in comparison with black level after tweaking voltages only). Black level remained the same after reset, though I was greeted by the lovely black rain and enchanting IR, both of which were not there pre-reset. Yes I am able to remove both artifacts, though at a cost - an unacceptable rise in black level (which is prob the stock black level).
Pioneer Kuro KRP-500M
Pioneer Kuro PRO-141FD
Pioneer Kuro PRO-111FD x 2
Pioneer Kuro PDP-5020 x 2