2000 Jaguar Xj8 Records Invoices Dealership Last Owner That Primary Secondary

have records and invoices from dealership with last owner that the primary and secondary tensioners and chains were replaced. Have a semi loud ticking noise from the middle of the engine driver side. Have had other cars over the years that developed lifter issues with a similar tick, constant at any rpm, both cold and hot. My other xj8 had a similar tick but originated from the tensioners and timing chain area. Any idea...is this a lifter???? if so from what i understand from forums only way to fix is to shim....any alternatives?? Thanks