Correct, Eastern had the tender for the 38 from deregulation until losing it on retendering to LRT in July 1989.But, for a period (late 1980s?), Easter Scottish won the tender for the 38 (Crewe Toll - Morningside - Cameron Toll) and turned it into a 38/58 circular that competed with the north/eastern side of the LRT 32/52
The C38/C58 circular ran for a few months in 1987 and was formed out of merging the C38 and the C6, whilst also serving Goldenacre, East Pilton and Muirhouse. It wasn't successful and soon reverted to its former route.