Find, If its not a last record

I wanted to append delimiter | (pipe symbol) to differentiate each Maintenance Record. Field of a List unless it’s not last record

e.g. List of Aircraft {0001, 0002 etc.} each Aircraft has records of Maintenance work pending.

Maintenance Description

{

0001 - To do A, To Do B, To do C

0002 - To do D, To Do F

}

with below M query snippet, when I loop through each Maintenance Description it append an extra  | (pipe symbol) at end I would like to remove that 

#"Extracted Values" = Table.TransformColumns(
#"Filtered Rows",
{
"WorkLoadDetails",
each Text.Combine(
List.Transform(
_,
each ( Record.Field(_, "MaintenanceDescription") & " | "

}

))

Now data is shown like  

Maintenance Description

{

0001 - To do A | To Do B | To do C |

0002 - To do D | To Do F |

}

I want to remove that extra pipe symbol at the end. How can I know if its last record of list when I loop through each?