I've got about 100 mods loaded and of late I have been getting this message:

Unable to find referenced object:
"tl_StreetSpeaker_1" in script TL_Abolition

Does anyone have any ideas which mod is doing this?

Nevena's Twin Lamps and Juniper's Twin Lamps both use the TL_Abolition script. Juniper's refers to the "tl_StreetSpeaker_1".

An easy way to find things like this is to use http://www.inforapid.de/html/searchreplace.htm to search for one of the strings in the warning message in all your plugin files (in "Data Files").