Near as I can tell from my receipt history:
AF - AIR FILTER
AFC - Top off ASTM Virgin AFC (steering fluid?)
ATF - Automatic Transmission Fluid exchange
BFR - Brake Fluid Replacement
BSF - Brake Shoe Front
BTC - BATTERY TERMINAL CLEANING
CAF - Cabin Air Filter
EMS - EMISSIONS TESTING
ENG - Engine Flush
FC2 - 2-part Fuel system Cleaning
FDS - Front Differential Service
FS - Conventional oil Service
FLX - OTHER MISC FLUID
HAL - Halogen Lamp
MIN - Miniature lightbulb
RAD - Radiator Coolant exchange
RCP - Radiator Cap
RDS - Rear Differential Service
ROT - TIRE ROTATION
SSB - Signature Service Blend
SSS - SIGNATURE SERVICE SYNTHETIC
TIR - Tire Rotation (also ROT?)
TOA - Top Off Antifreeze
TOP -
WB - Wiper Blade
WRR - Windshield Repair Referral
WRS - Windshield Repair Service