Pulled the back seat out. Didn't see anything promising regarding a pull cord. There is a yellow vacuum line under the passenger side though that seems goes to the back. Perhaps this can be manipulated with either vacuum or pressure to actuate the trunk lock? It may just be for the fuel door though.

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84 300SD 274K
38K miles on flatplate heat exchanger and various diesel/veg blends. prior to that 4K miles on unheated veggie blends with kero and DinoD.