Gibson upright freezer not cooling?

-1999 gibson upright freezer is not freezing. compressor checks ok, defrost checks ok, thermo checks ok. we took the freon out and weighed it back in. amps read 151 from power cord to comp and 159 from the white wire. Tepm on discharge is 86 coming out of the comp and 86 coming out of the solinand cap tube is90 and cond is 79 evap is built in and cond is to. WHAT CAN I CHECK