when did car last run perfect for you, never, or after hacks? no real problem told ,just a fuse hunt and you have no service manual, USA car. not told nor told , what engine is there size, NAG1 is MB trans. PDC Fuse 37 runs the module transmission control. 15amps fuse battery the relay transmission drive F37 F37 box is not used for RLE box. just Nag1F26 is RLE. so some one put wrong PDC on this car?or RPO shows 42RLE, coded trans, (GM) 42RLE is GMNAG1 iS MB , German box Mercedes NAG1, 722.6, W5A580 ( seen in my Jeep 2010 GC.) here it is for sure and lots more fuse , not just 1. for trans.
are you dead sure its NAG1 and not 42RLE boxside of box tells that. TAG.and VIN code too. has trans code.ask your FCA dealer for VIN decode for actual transmission installed new