The error is in the last line of code with the error saying SyntaxError: invalid syntax
# Step 10 - DISSOLVE RDiffIntersect using FID_RDiffBuffer and FID_"AreaFileName"
arcpy.Dissolve_management(in_features="RDiff_AreaIntersect",
out_feature_class="C:/Users/User/Desktop/claudio.gdb/RDiff_AreaIntersect_Dissolve",
dissolve_field="FID_RDiffBuffer",
ORIG_FID, statistics_fields="OBJECTID_1 FIRST;FID_RDiffBuffer FIRST;gps_latitu FIRST;gps_longit FIRST",
ORIG_FID FIRST, multi_part="MULTI_PART", unsplit_lines="DISSOLVE_LINES")