Did the temp change in the room since you last checked? When I worked for GM years ago I used to do axles and was freaked out one morning I came back in and double checked my backlash on a Camaro and found the same thing.... magically it grew in spec... then an old timer told me not to worry. Shop was down to 30 degreees the night before. The dealership shut off the heat at night. Long story short I waited until noon and rechecked and it was 1/2 way back to the spec i set it at at 4pm the day before.
